Question

Find the geometric number between 4 and 5.

Answer 1

`2√(5)`

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Geometric mean of two numbers is the square root of their product.

The number we are looking for is:

• 
  `√(4*5)=2√(5)`

Answer 2

The geometric mean of x and y is
`√(xy)`

So the geometric mean of 4 and 5 is
`√(4*5) = √(20) \approx 4.472`