Question

Find the measure of x and y.

Answer 1

Create a proportion for x first. Use known values.

$\frac{4}{x} =\frac{12}{21}$

84 = 12x

Divide both sides by 12.

x = 7

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Create a proportion for y.

$\frac{12}{y} =\frac{4}{10}$

120 = 4y

Divide both sides by 4.

y = 30

$\boxed {x = 7,~y = 30}$