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# mean proportional

## noun

,

*Mathematics.*- (between two numbers
*a*and*b*) a number*x*for which*a/x*=*x/b*:*The number 3 is a mean proportional between 1 and 9.*

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## Word History and Origins

Origin of mean proportional^{1}

First recorded in 1565–75

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## Example Sentences

We then find the mean proportional between the length HD and the height of the parallelogram.

From Project Gutenberg

Then x - 5 is a mean proportional between x - 9 and x, from which we find that x equals 25.

From Project Gutenberg

Lastly, as there is only one mean proportional between each relation, there is also only one good government possible for a State.

From Project Gutenberg

In the Pyramid Cheops, altitude is very nearly a mean proportional between apothem and half base.

From Project Gutenberg

To find a mean proportional between two given straight lines.

From Project Gutenberg

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