Solving a Proportion for a Variable

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Taught by mrbrianmclogan
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Lesson Summary:

In this lesson, you will learn how to solve proportions for a variable using two different techniques. The first technique involves understanding the inverse and opposite operations and using them to cancel out the fractions, while the second technique involves cross multiplication. Whether you choose to use the first or second technique, you will end up with the same answer. So choose the method that works best for you and solve those proportions with ease!

Lesson Description:

Solving a proportion for a variable

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:
  • Why does cross multiplication work in proportion problems?
  • Can you simplify a fraction in a proportion problem before you solve the proportion problem?
  • Can you simplify a ratio in a proportion problem before you solve the proportion problem?
  • Staff Review

    • Currently 4.0/5 Stars.
    Two techniques are shown on how to solve a proportion problem.