87 is what percent of 388 - 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 388 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 388, so we can write it down as 100%=388.
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%=388
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%=388/87
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 388

100%/x%=388/87
(100/x)*x=(388/87)*x       - we multiply both sides of the equation by x
100=4.4597701149425*x       - we divide both sides of the equation by (4.4597701149425) to get x
100/4.4597701149425=x
22.422680412371=x
x=22.422680412371

now we have:
87 is 22.422680412371% of 388