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Proportion

Maths: Edexcel A Level Pure Maths, topic 2.5.8

Proportion

Two pairs of numbers are in proportion if the ratio between the first pair is equivalent to the ratio between the second pair.

Ratios in proportion

Ratios in proportion

  • An equals sign between two ratios means that the two ratios are in proportion.
Worded problems

Worded problems

  • Worded problems can be converted into proportions.
  • ‘The ratio of male to female pupils on a school trip is 5 : 2’
  • This can be written as m : f = 5 : 2
Proportions and fractions

Proportions and fractions

  • Proportions can be converted into an equation involving fractions.

Test yourself on Proportion

  • There are 5 times as many green pens (g) as blue pens (b). Which proportion represents this relationship?

  • There are 8 times as many green pens (g) as blue pens (b). Which proportion represents this relationship?

  • There are 3 times as many green pens (g) as blue pens (b). Which proportion represents this relationship?

  • w : x = y : z
    Which equation represents this proportion?

  • 3 : 1 = 6 : 2
    Which equation represents this proportion?

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