In a rectangle, the ratio of the width to the length is 4:5. If the rectangle is 40 centimeters long, find its width.
We can solve this with a proportion
4 / 5 = W / 40 where W is the width.....cross-multiply
40 * 4 = 5 * W
160 = 5 * W divide both sides by 5
32 cm = W
