if it is geometric, r=60/72=10/12=5/6
adn then 5/6(60=50
and then 40(5/6)=200/6=100/3, so that is not a geometric series. Did your teacher make an error? Lets test if she meant it to be a geometric series, r=5/6
sum=72/(1-5/6)=72*6=amazing, the answer is there.
So I bet your teacher meant 100/3 as the fourth term.
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