87 is what percent of 1977 - 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 1977 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 1977, so we can write it down as 100%=1977.
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%=1977
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%=1977/87
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 1977

100%/x%=1977/87
(100/x)*x=(1977/87)*x       - we multiply both sides of the equation by x
100=22.724137931034*x       - we divide both sides of the equation by (22.724137931034) to get x
100/22.724137931034=x
4.4006069802731=x
x=4.4006069802731

now we have:
87 is 4.4006069802731% of 1977