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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.

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 Smith, David Eugene

If 4 quantities are in proportion and the second is a mean proportional between the third and fourth, prove that the third will be a mean prop. between the first and second.

From A Review of Algebra by Rivenburg, Romeyn Henry

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

From Amusements in Mathematics by Dudeney, Henry Ernest

To find a mean proportional between two given straight lines.

From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" by Various

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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