SOLUTION: Can you help me understand geometric sequences example. 5, - , 39. What would be the -? How can I find this? Thank you

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Question 956934: Can you help me understand geometric sequences example. 5, - , 39. What would be the -? How can I find this? Thank you
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
5,X,39
By definition,
X%2F5=k
39%2FX=k
So then,
X%2F5=39%2FX
X%5E2=5%2A39
X%5E2=195
X=sqrt%28195%29
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5,sqrt%28195%29,39