687.4 is what percent of 855 - 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 855 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 855, so we can write it down as 100%=855.
4. We know, that x% equals 687.4 of the output value, so we can write it down as x%=687.4.
5. Now we have two simple equations:
1) 100%=855
2) x%=687.4
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%=855/687.4
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 687.4 is what percent of 855

100%/x%=855/687.4
(100/x)*x=(855/687.4)*x       - we multiply both sides of the equation by x
100=1.2438172825138*x       - we divide both sides of the equation by (1.2438172825138) to get x
100/1.2438172825138=x
80.397660818713=x
x=80.397660818713

now we have:
687.4 is 80.397660818713% of 855