## Basic College Mathematics (10th Edition)

$\frac{6}{9}=\frac{10}{15}$
We are given that 6 dollars is to 9 dollars as 10 dollars is to 15 dollars. In order to write this as a proportion, we can write both relations as fractions. 6 dollars is to 9 dollars can be written as $\frac{6 dollars}{9 dollars}$ 10 dollars is to 15 dollars can be written as $\frac{10 dollars}{15 dollars}$ Next, we can set both fractions equal to each other, which gives us a proportional relationship. $\frac{6 dollars}{9 dollars}=\frac{10 dollars}{15 dollars}$ Since the units in the numerators and denominators are same, we can simplify by dropping the units from both fractions. $\frac{6}{9}=\frac{10}{15}$