Solving a Word Problem with Proportions

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Taught by mrbrianmclogan
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Lesson Summary:

In this lesson, you will learn how to solve word problems using proportions. The lesson uses an example of a class with three fewer girls than boys, and a ratio of 4 to 5 of girls to boys. You will learn how to write ratios in fractional form and how to create a proportion to solve for the variable. By defining the variable and using cross multiplication, you can isolate the variable and solve for it. The final step is to check your answer by making sure it satisfies the question being asked.

Lesson Description:

Solving a word problem using proportions

I show how to solve math problems online during live instruction in class. This is my way of providing free tutoring for the students in my class and for students anywhere in the world. Every video is a short clip that shows exactly how to solve math problems step by step. The problems are done in real time and in front of a regular classroom. These videos are intended to help you learn how to solve math problems, review how to solve a math problems, study for a test, or finish your homework. I post all of my videos on YouTube, but if you are looking for other ways to interact with me and my videos you can follow me on the following pages through My Blog, Twitter, or Facebook.

Questions answered by this video:
  • How do I solve a word problem with a ratio in it?
  • If there are 3 fewer girls than boys in a class, and the ratio of girls to boys is 4 to 5, then how many students are in the class.
  • Staff Review

    • Currently 4.0/5 Stars.
    This lesson shows an example of how to solve a word problem with a ration in it by setting up a proportion.