Given that the third term of the GP, a₃ = 4

Let us assume the GP mentioned in the question be,

…

With the first term and common ratio R.

Now, the third term in the assumed GP is A.

So, A = 4 (given data)

Now,

Product of the first five terms of GP= = A⁵

So, the required product = A⁵ = 4⁵ = 1024

∴ The product of first five terms of a GP with its third term 4 is 1024.