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# Proportionality

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For the corresponding concept related to ratio, see Proportions.

A **proportionality relationship** happens when two quantities or numbers *x* and *y* are related multiplicatively by a fixed number. This can occur when either their ratio *x*/*y* is a fixed number (direct proportionality), or their product *xy* is a fixed number (inverse proportionality). If *x* is directly proportional to *y*, then we write [math]x \propto y[/math].^{[1]} The fixed number of a proportionality relationship is called the constant of proportionality.^{[2]}^{[3]}

## Related pages

## References

- ↑ "Compendium of Mathematical Symbols" (in en-US). 2020-03-01. https://mathvault.ca/hub/higher-math/math-symbols/.
- ↑ Weisstein, Eric W.. "Proportional" (in en). https://mathworld.wolfram.com/Proportional.html.
- ↑ "Directly Proportional and Inversely Proportional". https://www.mathsisfun.com/algebra/directly-inversely-proportional.html.