# Applications of Proportions 1

Taught by muchomath
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Meets NCTM Standards:
Lesson Summary:

In this lesson on Applications of Proportions, the teacher explains how to solve a problem through the use of ratios and proportions. Using the example of a tutoring service, the teacher guides students through the steps of setting up and solving a proportion problem using cross-multiplication. By the end of the lesson, students will have a clear understanding of how to use proportions to solve everyday problems.

Lesson Description:

Learn some applications of proportions and how to use proportions to solve everyday problems.

Created by and copyright of Larry Perez. Funded by the state of California through Saddleback College. More information on videos, resources, and lessons at Algebra2Go.

Questions answered by this video:
• How can proportions be used in real life?
• What is an application of proportions?
• If the ratio of students who used a tutoring service to those who did not was 3 to 8, and the number of students who did not use the lab was 15 more than the number who did, how many students use the service and how many did not?
• How do you set up a rational equation to solve a word problem?
• How do you solve 3/8 = x/(x+15) by cross multiplying?
• #### Staff Review

• Currently 4.0/5 Stars.
This lesson uses proportions to show an application of how they can be used. All steps are shown in this application of finding the number of students who used a tutoring service. An algebraic proportion is set up and solved in this video.