170.99 is what percent of 210.99 - 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 210.99 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 210.99, so we can write it down as 100%=210.99.
4. We know, that x% equals 170.99 of the output value, so we can write it down as x%=170.99.
5. Now we have two simple equations:
1) 100%=210.99
2) x%=170.99
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%=210.99/170.99
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 170.99 is what percent of 210.99

100%/x%=210.99/170.99
(100/x)*x=(210.99/170.99)*x       - we multiply both sides of the equation by x
100=1.2339318088777*x       - we divide both sides of the equation by (1.2339318088777) to get x
100/1.2339318088777=x
81.041755533438=x
x=81.041755533438

now we have:
170.99 is 81.041755533438% of 210.99