71.5 is what percent of 87 - step by step solution

To get the solution, we are looking for, we need to point out what we know.

1. We assume, that the number 87 is 100% - because it's the output value of the task.
2. We assume, that x is the value we are looking for.
3. If 100% equals 87, so we can write it down as 100%=87.
4. We know, that x% equals 71.5 of the output value, so we can write it down as x%=71.5.
5. Now we have two simple equations:
1) 100%=87
2) x%=71.5
where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:
100%/x%=87/71.5
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 71.5 is what percent of 87

100%/x%=87/71.5
(100/x)*x=(87/71.5)*x       - we multiply both sides of the equation by x
100=1.2167832167832*x       - we divide both sides of the equation by (1.2167832167832) to get x
100/1.2167832167832=x
82.183908045977=x
x=82.183908045977

now we have:
71.5 is 82.183908045977% of 87