Use a proportion to solve the problem

The answer is 356 doctors prefer fast food.

If you cross multiply, it will help you solve this problem. Sorry about the periods, it's the only way I could make this look right. Just ignore them, please.

4......n
_..X.._

5.....445

4 x 445 = 1780
1780 / 5 = 356

n = 356

Let x doctors prefer fast food. Then we set up a proportion as
4: 5 = x: 445
Now, 5 * x = 4 * 445
x = 4 * 445/5 = 89 * 4 = 356
356 doctors prefer fast food.

Multiply the proportion by the number of doctors

So

4 out of 5 doctors is a proportion of 4/5

So 4/5 x 445 = 356

4 out of 5 doctors prefer fast food
? out of 445 doctors prefer fast food
4/5 x 445 = 4 x 89 = 356

It will never work in my case do something better not putting questions on the internet

4/5n=445
n=356

78% of 58 is

78% of 58 is

78% of 58 is