If 63 , 21 , 54 , and y are in proportion, then the value of y is:

Correct option is A

Given:

The numbers 63, 21, 54, and y are in proportion.
This implies:

​$$\frac{63}{21} = \frac{54}{y}$$​

Solution:

Using the rule of proportion:

​$$\frac{63}{21} = \frac{54}{y}$$​

63y =1134

y =$$\frac{1134}{63}$$​

y = 18