1. Which ratios form a proportion? Use equivalent ratios to test each pair.

a. \(\frac{4}{9}, \frac{2}{3}\)

b. \(\frac{6}{15}, \frac{9}{12}\)

c. \(\frac{12}{16}, \frac{15}{20}\)

d. \(\frac{18}{20}, \frac{24}{30}\)


2. Which ratio forms a proportion with \(\frac{20}{30}\)?

a. \(\frac{16}{24}\)

b. \(\frac{10}{20}\)

c. \(\frac{17}{51}\)

d. \(\frac{15}{60}\)


3. Which ratios form a proportion?

a. \(\frac{9}{17}, \frac{27}{50}\)

b. \(\frac{12}{35}, \frac{24}{75}\)

c. \(\frac{15}{55}, \frac{33}{121}\)

d. \(\frac{12}{35}, \frac{20}{70}\)