Question

determine o valor de x na proporção 12/48=16/x

Answer 1

12/48 = 16/x
12 x = 768  (16x48)
12 x = 768/12
x= 64

Answer 2

$\frac{12}{48} = \frac{16}{x}$

multiplica cruzado:

$12x = 48 *16 \\ \\ 12x = 768 \\ \\ x= \frac{768}{12} \\ \\ x = 64$