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mean proportional

American  

noun

Mathematics.
  1. (between two numbers a andb ) a number x for which a/x = x/b .

    The number 3 is a mean proportional between 1 and 9.


Etymology

Origin of mean proportional

First recorded in 1565–75

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

The perpendicular is the mean proportional between the segments of the hypotenuse.

From The Teaching of Geometry by David Eugene Smith

Then the whole line CZ is 139,655; and CS, which is a mean proportional between CZ and CO will be 93,410.

From Treatise on Light by Christiaan Huygens

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

From Amusements in Mathematics by Henry Ernest Dudeney

Each of the other sides is the mean proportional between the hypotenuse and the segment of the hypotenuse adjacent to that side.

From The Teaching of Geometry by David Eugene Smith

When 5 and 20 are given, x is a mean proportional when in 5, x, 20, 5 is to x as x to 20.

From A Budget of Paradoxes, Volume II by David Eugene Smith

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