Two equations I and II are given below:

I) (1/19) × 11400 + a% of 450 = 14 × 70 - 59 × 4

II) √(800 ÷ 25 + b + 360 ÷ 15) = 264 ÷ 33

A series is given below with the wrong term X in it:

b, (a/2), (3b + 1), (a + 4), (6b - 2), (2a - 6)

If a new series is formed, whose 1st term is X and it follows the same pattern as in the given series then find the 4th term of the new series?