87 is what percent of 2151 - 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 2151 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 2151, so we can write it down as 100%=2151.
4. We know, that x% equals 87 of the output value, so we can write it down as x%=87.
5. Now we have two simple equations:
1) 100%=2151
2) x%=87
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%=2151/87
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 87 is what percent of 2151

100%/x%=2151/87
(100/x)*x=(2151/87)*x       - we multiply both sides of the equation by x
100=24.724137931034*x       - we divide both sides of the equation by (24.724137931034) to get x
100/24.724137931034=x
4.044630404463=x
x=4.044630404463

now we have:
87 is 4.044630404463% of 2151