Solving Proportions

 $\frac{3}{y}=\frac{5}{15}$  

Do the following ratios form a proportion:  $\frac{4}{5},\ \frac{12}{15}$  ?

Do the following ratios form a proportion:  $\frac{1}{8},\ \frac{1}{16}$  ?

 $\frac{4}{7}=\frac{z}{28}$  

 $\frac{15}{4}=\frac{x}{24}$  

 $\frac{y}{50}=\frac{5}{10}$  

 $\frac{x}{120}=\frac{1}{10}$  

Fifteen scoops of lemonade drink mix are needed to make five gallons. How many gallons will six scoops of lemonade mix make?

(T/F) A proportion is an equation that states that two ratios are equivalent.