31.17 is what percent of 170.9 - 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 170.9 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 170.9, so we can write it down as 100%=170.9.
4. We know, that x% equals 31.17 of the output value, so we can write it down as x%=31.17.
5. Now we have two simple equations:
1) 100%=170.9
2) x%=31.17
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%=170.9/31.17
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 31.17 is what percent of 170.9

100%/x%=170.9/31.17
(100/x)*x=(170.9/31.17)*x       - we multiply both sides of the equation by x
100=5.4828360603144*x       - we divide both sides of the equation by (5.4828360603144) to get x
100/5.4828360603144=x
18.238736102984=x
x=18.238736102984

now we have:
31.17 is 18.238736102984% of 170.9