1.55 is what percent of 3.9 - 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 3.9 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 3.9, so we can write it down as 100%=3.9.
4. We know, that x% equals 1.55 of the output value, so we can write it down as x%=1.55.
5. Now we have two simple equations:
1) 100%=3.9
2) x%=1.55
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%=3.9/1.55
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 1.55 is what percent of 3.9

100%/x%=3.9/1.55
(100/x)*x=(3.9/1.55)*x       - we multiply both sides of the equation by x
100=2.5161290322581*x       - we divide both sides of the equation by (2.5161290322581) to get x
100/2.5161290322581=x
39.74358974359=x
x=39.74358974359

now we have:
1.55 is 39.74358974359% of 3.9