108 is 36% of what number? write and solve a proportion to solve the problem fast will give brainliest !

108 = .36x
divide both sides by .36
300 = x

(108/x)=(36/100)
(Is/of)=(percent/100)
Cross multiply
36x =108*100
36x=10800
Divide by 36
x= 300

(72/480)=(x/100)
Cross multiply again
480x = 72*100
480x=7200
Divide by 480
x= 15

23.25* 10% = 2.33
5% would be half of 2.33 or approx 1.15
Add the 2.33+1.15=3.48
So approx $3.50 tip

1.)

Let the number = x

Then, it would be: (x*36)/100 = 108

x*36 = 10800

x = 10800/36

x = 300

2.) Change 72 to a decimal. So it would be a .72
Then, you multiply that by 480 and your answer should be 345.6

3.) Estimate a 15% tip on a taxi ride that costs $23.25.

I will first round the cost to the nearest dollar.
$23.25 ≈ $23.00

I will now use mental math to find 10% of the cost.
$23.00 x 0.1= 2.3

5% is 1/2 of 10%, so it would be $1.15.

Finally, I will add the values to get 15% of the whatever.
2.3 x $1.15 = 3.45

The estimation of 3.45 is 3.50.

So, a 15% tip for a taxi ride for $23.25 is about $3.50.

Hope this is helpful!! :))

300 is the number.

Step-by-step explanation:

If you consider that number is "X" and then solve

x*36%=108

x=108/36%

x=(108)/(36/100)

x=300

Let the number = x

Then, it would be: (x*36)/100 = 108

x*36 = 10800

x = 10800/36

x = 300

The answer is 300.

x*36%=108  

x=108/36%  

x=(108)/(36/100)  

x=300

Given 36% is= 108

is/of = %/100

108/x= 36/100 (cross multiply)

36x= 10800 (divide by 36)

x= 300       to confirm 300x.36= 108

We set up a proportion: 108/?= 36/100

Cross multiply: 36*?= 108*100
⇒ ?= 108*100/36= 300

108 is 36% of 300.