Question

progressao aritmética . Numa P.G. de razao 2/3 tem-se a4=64/81.Calcule a5

Answer 1

$a_5=a_4\cdot q\\\\ a_5= \dfrac{64}{81}\cdot \dfrac{2}{3}\\\\\\ \Large\boxed{a_5= \dfrac{128}{243}}$