Question : What is the ratio of the mean proportional between 1.6 and 3.6 and the third proportional of 5 and 8?

Option 1: 2 : 15

Option 2: 5 : 16

Option 3: 3 : 16

Option 4: 4 : 15

Question : If $14 : 30 :: 7 : x$, then what is the value of $x$?

Option 1: 15

Option 2: 21

Option 3: 9

Option 4: 12

Question : If A : B = 2 : 5, B : C = 4 : 3, and C : D = 2 : 1, what is the value of A : C : D?

Option 1: 6 : 5 : 2

Option 2: 7 : 20 : 10

Option 3: 8 : 30 : 15

Option 4: 16 : 30 : 15

Question : What is the fourth proportional to 189, 273, and 153?

Option 1: 117

Option 2: 299

Option 3: 221

Option 4: 187

Question : Simplify the following expression.
$\frac{7}{10} \div \frac{3}{7}$ of $\left(2 \frac{3}{10}+2 \frac{3}{5}\right)+\frac{1}{5} \div 1 \frac{2}{5}-\frac{2}{7}$

Option 1: $-\frac{4}{21}$

Option 2: $\frac{5}{21}$

Option 3: $\frac{4}{21}$

Option 4: $-\frac{5}{21}$