A proportion is a statement that two ratios are equal. 
It is an equation with a ratio on each side.

Example:  4/8 = 2/4


When one of the four numbers in a proportion is
unknown, This is called solving the proportion.

Example: Solve for y: 1/2 = y/8.


Solving Proportion

Proportions and Similar Figures

Comparing Ratios- How to tell if to
ratios are equal by Using Proportion