89.9 is what percent of 31 - 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 31 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 31, so we can write it down as 100%=31.
4. We know, that x% equals 89.9 of the output value, so we can write it down as x%=89.9.
5. Now we have two simple equations:
1) 100%=31
2) x%=89.9
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%=31/89.9
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 89.9 is what percent of 31

100%/x%=31/89.9
(100/x)*x=(31/89.9)*x       - we multiply both sides of the equation by x
100=0.3448275862069*x       - we divide both sides of the equation by (0.3448275862069) to get x
100/0.3448275862069=x
290=x
x=290

now we have:
89.9 is 290% of 31