QuestionUse cross products to show equality: then $a \times d=b \times c$.
Write a proportion. 1) 21 is to 7 as 3 is to 1 . 2) 28 is to 32 as 7 is to 8 $\qquad$ 3) 3.2 is to 11 as 16 is to 55

Studdy Solution
Calculate the cross products for the third proportion:
$$3.2 \times 55 = 176$$ $$11 \times 16 = 176$$
Since $176 = 176$, the third proportion is verified.
All three proportions are verified using cross products.