What is the value of the fourth term in a geometric sequence for which a1 = 15 and r=1/3?

if i put something wrong your not gonna like it so rather not say nothing.

chemists are often responsible for designing a chemical reaction and analyzing the products obtained from it. one significant part of designing a chemical reaction is determining the amount of each reactant that is needed and the amount of each product that will be produced. in order to do so, chemists use stoichiometry, the quantitative relationships between reactants and products.