Select the option that is related to the fifth number in the same way as the second number is related to the first number and the fourth number is related to the third number.
4:20::15:240::19:?

Given: ​4:20::15:240::19:?

Logic: (first number)²+first number = second number

As,

4:20

4²+4=16+4=20

And

15:240

15²+15=225+15=240

Similarly,

19:?

19²+19=361+19=380

Thus, correct option is (c).