Question

What is the means proportional between 4 and 81

Answer 1

Given

4

18

Procedure

The mean proportional, or geometric mean, of two positive The mean proportional, or geometric mean, of two positive

`(a)/(x)=(x)/(b)`

When solving

`\begin{gathered} x=\sqrt[]{a\cdot b} \\ x=\sqrt[]{4\cdot81} \\ x=\sqrt[]{324} \\ x=18 \end{gathered}`

The answer would be 18