Answer:

1. 5

Since

11 : X = 33 : 15

Then we know

X/11 = 15/33

Multiplying both sides by 11 cancels on the left

11 × (X/11) = (15/33) × 11

X = (15/33) × 11

Then solving for X

X = 11 × (15/33)

X = 5

Therefore

11 : 5 = 33 : 15

2. 18.75

Since

X : 30 = 5 : 8

Then we know

X/30 = 5/8

Multiplying both sides by 30 cancels on the left

30 × (X/30) = (5/8) × 30

X = (5/8) × 30

Then solving for X

X = 30 × (5/8)

X = 18.75

Therefore

18.75 : 30 = 5 : 8

3. 2.3142857142857

Since

35 : 9 = 9 : X

Then we know

9/35 = X/9

Multiplying both sides by 9 cancels on the right

9 × (9/35) = (X/9) × 9

9 × (9/35) = X

Then solving for X

X = 9 × (9/35)

X = 2.3142857142857

Therefore

35 : 9 = 9 : 2.3142857142857

4. 42

Since

4 : 6 = 28 : X

Then we know

6/4 = X/28

Multiplying both sides by 28 cancels on the right

28 × (6/4) = (X/28) × 28

28 × (6/4) = X

Then solving for n

X = 28 × (6/4)

X = 42

Therefore

4 : 6 = 28 : 42