Question

Encontre o valor da quarta proporcional (x). a) 81, 63, 9, x b) 6, 7, 18, x
Ajuda ai pleseeee

Answer 1

Explicação passo-a-passo:

a) 81, 63, 9, x

81x = 63 * 9

81x = 567

x = 567/81

x = 7

b) 6, 7, 18, x

6x = 18 * 7

6x = 126

x = 126/6

x = 21

Answer 2

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$\tt a)~\sf \dfrac{\diagup\!\!\!\!\!\!81^9}{\diagup\!\!\!\!\!\!63_7}=\dfrac{9}{x}\\\sf\dfrac{\diagup\!\!\!9}{7}=\dfrac{\diagup\!\!\!9}{x}\implies x=7\checkmark$

$\tt b)~\sf\dfrac{\diagup\!\!\!6^1}{7}=\dfrac{\diagup\!\!\!\!18^3}{x}\\\sf x=7\cdot3\\\huge\boxed{\boxed{\boxed{\boxed{\sf x=21}}}}$