Posted by **ELIJAH HAVA** on Sunday, April 28, 2013 at 2:27am.

Insert three geometric means between 1 and 81.

- maths -
**Reiny**, Sunday, April 28, 2013 at 5:49am
1 , r , r^2 , r^3 , 81

so r/1 = 81/r^3

r^4 = 81

r = ± 3

the 3 geometric means could be

3, 9 , and 27

or

-3 , 9, and -27

## Answer this Question

## Related Questions

- arithmetic - 1. The first and last term of an A.P are, a and l respectively, ...
- arithmetic - 1. The first and last term of an A.P are, a and l respectively, ...
- math - Write three arithmetic and three geometric means between 4 and 324
- Pre-Calculus-check answers - Find the sixth term in the geometric sequence: ...
- Please...help me over here.,Sequence and series - Insert three geometry means ...
- Math - Find the three geometric means between -2 and -32. Show the work that ...
- Pre-Calc. - Write the geometric sequence that has four geometric means between 1...
- math - insert two numbers between 5 and 135, so that the 4 may form a geometric ...
- math - 1) If the number 1,1/3,1/9, are terms of Geometric progression. Find its ...
- PRE-CALCULUS - INSERT THE SEVEN ARITHMETIC MEANS BETWEEN 3 AND 9