If 19, 57, 81, and y are in proportion, then the value of y is:

Correct option is A

Given:

Four numbers are in proportion:

19 : 57 = 81 : y

Concept Used:

In a continued proportion:

a : b = c : d

a × d = b × c

Solution:

​$$19 \times y = 57 \times 81 \\ \ \\y = \frac{57 \times 81}{19}\\ \ \\y = 243$$​​