405.4 is what percent of 550 - 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 550 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 550, so we can write it down as 100%=550.
4. We know, that x% equals 405.4 of the output value, so we can write it down as x%=405.4.
5. Now we have two simple equations:
1) 100%=550
2) x%=405.4
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%=550/405.4
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 405.4 is what percent of 550

100%/x%=550/405.4
(100/x)*x=(550/405.4)*x       - we multiply both sides of the equation by x
100=1.3566847557967*x       - we divide both sides of the equation by (1.3566847557967) to get x
100/1.3566847557967=x
73.709090909091=x
x=73.709090909091

now we have:
405.4 is 73.709090909091% of 550