Single rule of three direct online

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Find out x, in such proportion to c as b is to a.

For example:

If 4 kg of a product cost $36, how much would be the cost of 18 kg? Answer: a: 4, b: 36, c: 18, x: 162 ($162)

If 2 liters of paint are required to paint 5 rooms, how many liters are required to paint 7 rooms? Answer: a: 5, b: 2, c: 7, x: 2.8 (liters)


  • Value of a
  • Value of b
  • Value of c
  • Number of decimal places (round)


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