643.9 is what percent of 670 - 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 670 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 670, so we can write it down as 100%=670.
4. We know, that x% equals 643.9 of the output value, so we can write it down as x%=643.9.
5. Now we have two simple equations:
1) 100%=670
2) x%=643.9
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%=670/643.9
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 643.9 is what percent of 670

100%/x%=670/643.9
(100/x)*x=(670/643.9)*x       - we multiply both sides of the equation by x
100=1.0405342444479*x       - we divide both sides of the equation by (1.0405342444479) to get x
100/1.0405342444479=x
96.10447761194=x
x=96.10447761194

now we have:
643.9 is 96.10447761194% of 670