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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

• Disambiguation pages