Difference between revisions of "Proportionality (mathematics)"
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Latest revision as of 08:41, 7 April 2016
In mathematics, two variables are proportional if a change in one is always accompanied by a change in the other, and if the changes are always related by use of a constant multiplier.
The constant is called the coefficient of proportionality or proportionality constant.
Discussion
If one variable is always the product of the other and a constant, the two are said to be directly proportional. x and y are directly proportional if the ratio \tfrac yx is constant.
If the product of the two variables is always equal to a constant, the two are said to be inversely proportional. x and y are inversely proportional if the product xy is constant.
See also
- Analogy
- Aspect ratio
- Golden ratio
- Mathematics
- Measurement
- Number
- Ratio
- Scalability
- Scale (ratio)
- Scaling (geometry)
External links
- Proportionality (mathematics) @ Wikipedia
