## Intermediate Algebra (6th Edition)

$a_{4}= - \frac{8}{9}$
Given, $a_{1} = 3$ $r = -\frac{2}{3}$ $a_{n}$ of geometric sequence is $a_{n} = a_{1} . r^{n-1}$ To find fourth term, substitute $a_{1} ,$ $r$ values and $n=4$ $a_{4} = a_{1} . r^{4-1}$ $a_{4} = a_{1} . r^{3}$ $a_{4} = 3 \times (-\frac{2}{3})^{3}$ $a_{4} = 3 \times (-\frac{8}{27})$ $a_{4} = -\frac{8}{9}$