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Constant of proportionality with fraction values

Year 8 maths · Fieldbook Learning

Name ______________________ Date __________

The constant of proportionality is y divided by x.

  1. y is proportional to x. When x = 8, y = 48. Find the constant of proportionality k in y = kx.
  2. y is proportional to x. When x = 8, y = 20. Find the constant of proportionality k in y = kx.
  3. y is proportional to x. When x = 18, y = 45. Find the constant of proportionality k in y = kx.
  4. y is proportional to x. When x = 16, y = 80. Find the constant of proportionality k in y = kx.
  5. y is proportional to x. When x = 14, y = 77. Find the constant of proportionality k in y = kx.
  6. y is proportional to x. When x = 6, y = 42. Find the constant of proportionality k in y = kx.
  7. y is proportional to x. When x = 10, y = 20. Find the constant of proportionality k in y = kx.
  8. y is proportional to x. When x = 12, y = 78. Find the constant of proportionality k in y = kx.
  9. y is proportional to x. When x = 18, y = 63. Find the constant of proportionality k in y = kx.
  10. y is proportional to x. When x = 22, y = 110. Find the constant of proportionality k in y = kx.
  11. y is proportional to x. When x = 18, y = 117. Find the constant of proportionality k in y = kx.
  12. y is proportional to x. When x = 14, y = 112. Find the constant of proportionality k in y = kx.
  13. y is proportional to x. When x = 24, y = 204. Find the constant of proportionality k in y = kx.
  14. y is proportional to x. When x = 16, y = 192. Find the constant of proportionality k in y = kx.
  15. y is proportional to x. When x = 6, y = 66. Find the constant of proportionality k in y = kx.
  16. y is proportional to x. When x = 32, y = 384. Find the constant of proportionality k in y = kx.
  17. y is proportional to x. When x = 14, y = 182. Find the constant of proportionality k in y = kx.
  18. y is proportional to x. When x = 28, y = 406. Find the constant of proportionality k in y = kx.
  19. y is proportional to x. When x = 12, y = 150. Find the constant of proportionality k in y = kx.
  20. y is proportional to x. When x = 8, y = 52. Find the constant of proportionality k in y = kx.
More free practice: fieldbooklearning.com/uk/practice/year-8/constant-of-proportionality-with-fraction-values/

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Answer key: Constant of proportionality with fraction values

  1. 6
  2. 5/2
  3. 5/2
  4. 5
  5. 11/2
  6. 7
  7. 2
  8. 13/2
  9. 7/2
  10. 5
  11. 13/2
  12. 8
  13. 17/2
  14. 12
  15. 11
  16. 12
  17. 13
  18. 29/2
  19. 25/2
  20. 13/2