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
 - 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
 - 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
 
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