Write the sentence as a proportion then determine whether the proportion is true or false.
Four bags of flour costs \$12, and eight bags of flour costs \$18.

Express the sentence as a proportion.

A recipe uses 3 cups of rice for 5 cups of broth, and 15 cups of rice for 25 cups of broth.

Express the sentence as a proportion.

A car travels 80 miles in 2 hours and 120 miles in 3 hours.

Express the sentence as a proportion.

A paint mixture uses 2.5 liters of blue paint for every 4 liters of white paint, and another mixture uses 7.5 liters of blue paint for every 12 liters of white paint.

Express the sentence as a proportion.

A trail map shows 3.6 miles in 1.2 hours, while another section shows 7 miles in $2\frac{1}{3}$ hours.

Determine whether the proportion is true or false.

$\frac{1\frac{2}{3}}{3}=\frac{3\frac{1}{3}}{6}$

Determine whether the proportion is true or false.

$\frac{2.4}{6}=\frac{1.2}{4}$

Use cross products to determine whether the proportion is true or false.

$\frac{7}{4}=\frac{20}{12}$

Use cross products to determine whether the proportion is true or false.

$\frac{4}{9}=\frac{12}{27}$