# How could you use cross products to check the solution to this proportion #12/30=5/x#?

##### 1 Answer

Oct 27, 2016

#### Explanation:

You will have to have a solution first ..

Cross multiplying is a way of finding the solution, but we will use that to check later. Let's use another method to find

Notice that

To check whether this is correct: cross-multiply...

Is

We find:

Therefore we have the correct solution for

This is true for any equivalent fractions: