Question

4) Determine a quarta proporcional x:

a) 2:4 = 5:x

B)5:4 = 10:x

c) 20:2 = 50:x

d) 3:6 = 5:x​

Answer 1

Resposta:

Explicação passo a passo:

a)

$\frac{2}{4} =\frac{5}{x}$

$2x=20$

$x = 20 : 2$

$x=10$

b)

$\frac{5}{4} =\frac{10}{x}$

$5x=40$

$x= 40:5$

$x=8$

c)

$\frac{20}{2}=\frac{50}{x}$

$20x=100$

$x=100:20$

$x=5$

d)

$\frac{3}{6} =\frac{5}{x}$

$3x=30$

$x=30:3$

$x=10$