91Ó°ÊÓ

The ratio of a person's height to the length of the person's lower arm (from elbow to wrist) is approximately 6.5 to \(1 .\) Measure your own height and lower arm length. Is the ratio you get close to the average of 6.5 to \(1 ?\)

The ratio of a person's height to the person's shoulder width (measured from outside shoulder to outside shoulder) is approximately 4 to \(1 .\) Measure your own height and shoulder width. Is the ratio you get close to the average of 4 to \(1 ?\)

Write a proportion for each statement. Then solve for the variable. 25 is to 100 as 9 is to \(y\)

Solve the proportions. $$\frac{x-2}{4 x}=\frac{3}{8}$$

Solve the proportions. $$\frac{x+3}{x}=\frac{5}{4}$$