Solving Proportions
We will be using proportions to solve real life problems. Before we tackle that, let’s look at how we solve the proportion once it is set up.
To solve a proportion, we are looking for the value of the variable which makes the ratios equal. Use the same process as we just used, cross multiply and then solve the equation.
Example:
Solve: 
Solution:
Start by cross multiplying.
We can check this answer to see if the ratios are, indeed, equal. We do this by substituting it into the original proportion.
The products are equal when you cross multiply, so the solution is correct.
