Question
Find the mean proportional between:
3 and 27
3 and 27
✓
Answer
$3 : \text{x} : : \text{x} : 27$
$\Rightarrow\text{x}^2 = 3 \times 27 = 81$
$\text{x} = \sqrt{81} = 9$
Mean proportional = 9
$\Rightarrow\text{x}^2 = 3 \times 27 = 81$
$\text{x} = \sqrt{81} = 9$
Mean proportional = 9
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