490.5 is what percent of 621 - 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 621 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 621, so we can write it down as 100%=621.
4. We know, that x% equals 490.5 of the output value, so we can write it down as x%=490.5.
5. Now we have two simple equations:
1) 100%=621
2) x%=490.5
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%=621/490.5
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 490.5 is what percent of 621

100%/x%=621/490.5
(100/x)*x=(621/490.5)*x       - we multiply both sides of the equation by x
100=1.2660550458716*x       - we divide both sides of the equation by (1.2660550458716) to get x
100/1.2660550458716=x
78.985507246377=x
x=78.985507246377

now we have:
490.5 is 78.985507246377% of 621