Khan Academy
Khan Academy: Algebra: Alternate Solution to Ratio Problem
A step-by-step demonstration on an alternate method for how to solve a ratio problem algebraically with cross multiplication. [7:02]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Find an Unknown in a Proportion 2
This video shows how to find an unknown quantity in a proportion in the context of a word problem. Practice problems are available. [5:48]
Khan Academy
Khan Academy: Algebra: Find an Unknown Proportion 2
A step-by-step breakdown on how to solve an application problem with an unknown proportion. Practice problems available. This video also appears in the strand Arithmetic and Pre-Algebra: Ratios and Proportions. [5:48]
Khan Academy
Khan Academy: Algebra: Find an Unknown in a Proportion
Video demonstrates how to find an unknown in a proportion three different ways including algebraically with cross multiplication. This video also appears in the strand Arithmetic and Pre-Algebra: Ratios and Proportions. [7:20]
Khan Academy
Khan Academy: Algebra: Understanding Proportions
Short video explaining how to understand proportions. This video also appears in the strand Arithmetic and Pre-Algebra: Ratios and Proportions. [1:25]
Khan Academy
Khan Academy: Algebra: Ratio and Proportion
Step-by-step instructions on how to solve ratio and proportion word problems. This video is also found in the strand Algebra: ck12.org. [10:25]
Math TV
Math tv.com: Basic Mathematics: Solving Proportions
A math teacher and several students offer step-by-step solutions to questions involving proportions. Questions include, "In the proportion 3/4 = 6/8, name the four terms, the means, and the extremes" and "Solve for x: 2/3 = 4/x". In the...
Math TV
Math tv.com: Basic Mathematics: Solving Proportions: Applications
A math teacher and his students provide step-by-step solutions to word problems dealing with proportions. Example questions include, "A recipe for 16 brownies calls for 2/3 cup of butter. How many brownies can be made from 1 cup of...
Math Mammoth
Math Mammoth: What Is a Proportion? Three Ways to Solve Proportions
Explains what proportions are and three ways to solve them. [5:49]
Math Mammoth
Math Mammoth: Proportion Word Problems: Pre Algebra Lesson
Demonstrates how to solve three word problems using ratios and proportions. [5:55]
Khan Academy
Khan Academy: Ratios and Proportions: Ratio and Proportion
This video solves a problem involving ratio and proportions.
Virtual Nerd
Virtual Nerd: How Do You Set Up a Proportion From a Word Problem?
By watching this tutorial, you will learn the steps to take in order to turn a word problem involving a blueprint into a proportion. [2:13]
Virtual Nerd
Virtual Nerd: What's a Proportion?
Watch this tutorial to learn why proportions are actually equations with equal ratios. [3:45]
Virtual Nerd
Virtual Nerd: How Do You Solve a Word Problem Using a Proportion?
This tutorial demonstrates how to use the scale from a blueprint of a house to help find the actual height of the house by using a proportion to solve. [2:29]
Khan Academy
Khan Academy: Graphing Proportional Relationships From an Equation
Video lesson shows how to graph the equation of a line that represents a proportional relationship given an equation. [3:08]
Khan Academy
Khan Academy: Ratios With Algebra: Find an Unknown in a Proportion
Video demonstrates how to find an unknown in a proportion three different ways..
Khan Academy
Khan Academy: Ratios and Proportions: Understanding Proportions
This video shows how to determine if a given proportion is true or false.
Sophia Learning
Sophia: Solving More Difficult Proportions With an Unknown
This video lesson demonstrates how to solve proportions with an unknown variable. The tutorial includes detailed examples.
Sophia Learning
Sophia: Determining Proportionality Using Graphs and Tables
Determine whether objects of different shapes and sizes are proportional. Check understanding with a quiz.
Imagine Learning Classroom
Learn Zillion: Convert Between Currencies and Find Exchange Rate
In this lesson, you will learn how to convert between two different currencies and find the exchange rate by solving proportions. [3:47]
Imagine Learning Classroom
Learn Zillion: Identify the Constant of Proportionality From a Diagram
In this lesson, you will learn how to identify the constant of proportionality from a labeled diagram by writing an equation of the form y=mx and solving for m. [3:56]
Math Mammoth
Math Mammoth: Proportional Relationships / Direct Variation
This lesson explains several ways to determine if variables are in a proportional relationship. An example of a non-proportional relationship is given and inverse variation and direct variation are discussed. [11:55]
Math Antics
Math Antics: Proportions
Gain a basic understanding of proportions by watching this easy to understand video tutorial. Additional resources are available as part of a paid subscription service. [10:29]
Other
Algebra2go: Solving Proportions
Professor Perez's virtual classroom provides examples that demonstrate how to solve proportion problems. [7:18]