Proportionality, proportion or proportional may refer to:
Mathematics
- Proportionality (mathematics), the property of two variables being in a multiplicative relation to a constant
- Ratio, of one quantity to another, especially of a part compared to a whole
- Fraction (mathematics)
- Aspect ratio or proportions
- Proportional division, a kind of fair division
- Percentage, a number or ratio expressed as a fraction of 100
Science and art
- Proportional fonts
- Proportionally fair, a scheduling algorithm
- Proportional control, a type of linear feedback control system
Other uses
- Proportionality (law), a legal principle
- Proportionality (International Humanitarian Law), a law of war
- Proportion (architecture), describes the relationships between elements of a design
- Body proportions, in art, the study of relation of human body parts to each other and the whole
See also
- Proportional representation, in electoral systems
- Proporz, Austrian political practice