Question

what is the mean proportion of 4 and 5​

Answer 1

Answer:

Let x be the mean proportion between 4 and 5.

• 4,×,x 5 are in proportion.

• •

or 4: x::x :5

or x×x = 4×5

or X^2 = 20 = 2 ×2×5

Answer 2

Answer:

2√5 or √20 is mean proportional between 4 and 5.

Step-by-step explanation:

$4 : x : 5\\\implies x^2 = 4 \times 5 = 20\\\implies x = \sqrt{20} = 2\sqrt{5}$

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