661.5 is what percent of 830 - 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 830 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 830, so we can write it down as 100%=830.
4. We know, that x% equals 661.5 of the output value, so we can write it down as x%=661.5.
5. Now we have two simple equations:
1) 100%=830
2) x%=661.5
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%=830/661.5
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 661.5 is what percent of 830

100%/x%=830/661.5
(100/x)*x=(830/661.5)*x       - we multiply both sides of the equation by x
100=1.254724111867*x       - we divide both sides of the equation by (1.254724111867) to get x
100/1.254724111867=x
79.698795180723=x
x=79.698795180723

now we have:
661.5 is 79.698795180723% of 830