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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.

To this important proposition there is one corollary of particular interest, namely, The perpendicular from any point on a circle to a diameter is the mean proportional between the segments of the diameter.

From The Teaching of Geometry by Smith, David Eugene

Then the whole line DC is 141,289; and CP, which is a mean proportional between DC and CN, since MD touches the Ellipse, will be 105,032.

From Treatise on Light by Huygens, Christiaan

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

From The Teaching of Geometry by Smith, David Eugene

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 Huygens, Christiaan

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 Smith, David Eugene

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