Since
16:4 = 9: X
Then we know
46 = X/9
Multiplying both sides by 9 cancels on the right
9 × (4/16) = (X/9) × 9
9 × (4/16) = X
Then solving for X
X = 9 × (4/16)
X = 2.25
Therefore
16:4 = 9: 2.25
Since
4:1 = 12: X
A little less criticism from you,
and Hayley will be just fine
Then we know
1/4 = X/12
Multiplying both sides by 12 cancels on the right
12 × (1/4) = (X/12) × 12
12 × (1/4) = X
Then solving for X
X = 12 × (1/4)
X = 3
Therefore
4:1 = 12:3
Since
4:7 = 133 : X
Then we know
714 = X/133
[Multiplying both sides by 133 cancels on the right
133 × (714) = (X/133) × 133
133 × (714) = X
Then solving for X
X = 133 × (7/4)
X = 232.75
Therefore
4:7 = 133:232.75