GCSE Maths (AQA)

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Proportionality in Ratios

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Ratio, Proportion and Rates of Change Ratio, Proportion and Rates of Change

Proportionality in Ratios

3:32 Direct Proportionality
Spec R7
Previous Direct Proportionality Graphs Next Inverse Proportionality
  • Ratios are a way of writing the relationship between two quantities
  • The two quantities in a ratio are always directly proportional to each other
  • Ratios can be scaled up by multiplying both numbers in the ratio by the same thing
  • The relationship can be written as y is kx
  • The two numbers in a ratio are always directly proportional to each other
  • The price of a model of a famous statue is proportional to the height of the model
  • A unit ratio is a ratio where one of the numbers is 1
  • The unit ratio between a model's price and its height is 1 to 20cm
  • The constant of proportionality is equal to 20

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