Direct Proportion Calculator

A simple online direct proportion calculator to find the unknown value using the Rule of Three Direct Proportion method. Enter the values for the known values of 3 numbers in this rule of three calculator and click calculate to find the value of the unknown number.

Rule of Three Calculator

A simple online direct proportion calculator to find the unknown value using the Rule of Three Direct Proportion method. Enter the values for the known values of 3 numbers in this rule of three calculator and click calculate to find the value of the unknown number.

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Formula:

y = (b × x) / a Where, a = Value of a b = Value of b x = New Value of a y = New Value of b

Rule of Three: This rule is a method to solve proportions, which is defined as, if you have three numbers a, b, c, such that, a/b = c/x, also represented as a:b::c:x, then you can calculate the unknown value x, using the other three known values.

Direct Proportion: Direct proportion means that any increase in the known values increases the unknown value at the same rate

Direct Proportion Calculator: Here is an online Rule of three calculator for you to calculate the value of Y based on the Rule of three direct proportionate method. Just input the values for reliable results. For manual calculation, you can just divide products of value of 'b' and new value of 'a' by the value of 'a'

Example:

If I have 8 litres of milk to serve 2 families, then how many families I would need to 16 litres of milk?

Solution

Direct Proportion = 8 : 2
= 16 : ?
Applying the rule of three,
= 2 x 16 / 8
= 32 / 8
= 4 families


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