Direct proportionality

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Two quantities a and b are said to be directly proportional, if the quotient is constant. This is written as .

Constant of Proportionality

The constant is called constant of proportionality. Therefore a proportionality can be written as:

Famous Proportionality

Here, the constant is
Here, the constant is , the square of the speed of light.


The role of the quantities and of the constant are not interchangeable. It would be wrong to say in the examples above that or .


Weisstein, Eric W. "Proportional." From MathWorld--A Wolfram Web Resource.