Description: Some examples of writing two ratios and setting them equal to each other to solve proportion word problems. Created by Sal Khan. And what I want to do in this video is not solve the word problems but just set up the equation that we could solve to get the answer to the word problems. And essentially, we're going to be setting up proportions in either case. And let's just set x to be equal to our answer.*Teacher Advisor is 100% free.