Question

Resolva as seguinte proporcao 5/x+4=30/54

Answer 1

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$\frac{5}{x+4} = \frac{30}{54} \\ \\ 30(x+4)=5.(54) \\ \\ 30x+120=270 \\ \\ 30x=270-120 \\ \\ 30x=150 \\ \\ x=150\div30 \\ \\ x=5$

$\frac{5}{x+4} = \frac{5}{5+4} \\ \\ \frac{5}{9} = \frac{30}{54}$