Ratio and proportion

What do you call when two ratios are equal when you multiply the means and extremes?

(a)  

A cake recipe calls for 1 cups of milk and 3 cups of flour. Seth made a mistake and used 4.5 cups of flour. How many cups of milk should he use to keep the proportions correct?

Select all tables that represent a proportional relationship.

Carmen is downloading music. Each song is $1.75. Is this a proportional relationship?

Which of the following ratios form a proportion?

Determine whether each pair of ratios forms a proportion

Are  $\frac{3}{4}$   and  $\frac{24}{32}$   proportional? 

Is there a proportional relationship between x and y? Explain