What is 66.4 percent of 390 - 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 390 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 390 is 100%, so we can write it down as 390=100%.
4. We know, that x is 66.4% of the output value, so we can write it down as x=66.4%.
5. Now we have two simple equations:
1) 390=100%
2) x=66.4%
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:
390/x=100%/66.4%
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for what is 66.4% of 390

390/x=100/66.4
(390/x)*x=(100/66.4)*x       - we multiply both sides of the equation by x
390=1.5060240963855*x       - we divide both sides of the equation by (1.5060240963855) to get x
390/1.5060240963855=x
258.96=x
x=258.96

now we have:
66.4% of 390=258.96