Answers

2016-07-13T17:51:39+08:00
40, _ , 60
Given: a1 = 40, an = 60, n = 3, r = ?

Solving for r:
an = a1 ⚫r^(n-1)
Substitute the given...
60 = 40 ⚫ r^(3-1)
60 = 40r^2
r^2 = 60/40
√(r^2) = √(1.5)
r = 1.22474

a1 x r = a2
40 × 1.22474 = 48.99 or 49

So the geometric mean is 48.99 or 49.
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how about inserting 3 geometric means? pls answer
You just need to change the exponent of r then :) Since we will be inserting 3 terms between 40 and 60, the number of terms will become 5. You just need to identify the given and substitute it to the formula :)
thankyou very much!
No problem.