Formula and calculator for a term of a geometric progression

How to find b₁ in geometric progression on the Prostobank.com calculator?

We suggest you use our calculator to find the first (b₁) or any other member (b_n) of a geometric progression. Before pressing the “Calculate” button, you must enter the initial data: the value of any member of the progression and its ordinal number, the denominator, the number of the desired member of the progression. In a few seconds you will know what each member of a geometric progression is equal to. To find the first member of a progression, indicate the number of the desired member of the progression – 1.

Formula of a member of a geometric progression

b_n = b₁ × q^{(n – 1)}, b₁ – the first term of the progression, n is the number of terms of the progression, q is the denominator of the progression.

Formula for the first term of a geometric progression

b₁ = b_n ÷ q^{(n – 1)}