math

The 3rd term of a geometric progression is nine times the first term.if the second term is one-twenty fourth the 5th term.find the 4th term. solution ar^2=9a r=sqr of 9 r=3.pls help me on how to get the first term(a)

1. 👍 0
2. 👎 0
3. 👁 206
1. ar^2 = 9a
so, r = ±3

Now we have a problem. We know that r=3, so the 5th term must be 27 times the 2nd term, regardless of the value of a.

And, as you say, there is no way to determine a from the information given so far.

You sure it's not 24 less than the 5th term?

1. 👍 0
2. 👎 0
posted by Steve
2. Pls show work in details.

1. 👍 0
2. 👎 0

Similar Questions

1. math

the 3rd term of a geometric progression is nine times the 1st term.if the 2nd term is one-twenty fourth the 5th term.find the 4th term.(my solution so far).ar^2=9a r=sqr of 9 r=3.help me find the 1st term

asked by james on November 28, 2014
2. math

The 3rd term of a geometric progression is nine times the 1st term.if the 2nd term is one twenty fourth the 5th term.find the 4th term.(there is a mistake in the 2nd to the last statement.help locate the mistake{final answer 4th

asked by james on November 28, 2014
3. math

The 3rd term of an Arithmetic Progression is 10 more than the first term while the fifth term is 15 more than the second term. Find the sum of the 8th and 15th terms of the Arithmetic Progression if the 7th term is seven times the

asked by Toba on May 8, 2016
4. Math Algebra

The first term of a geometric progression is more than the third term by 12. The fourth term is more than the second term by 4. Find: i.the first term a and the common ratio r. ii. the n'th term of the progression.

asked by Leda on September 2, 2013
5. arithmetic

first term and larst term of a geometric progression is 42.if the forth term is greater than the second term by 168, find the first term.the forth term.

asked by charles on September 17, 2011
6. intro cal

the first 3 term of a geometric progression are k-4, 2k-4, 4k+4. what is the value of k? can someone help please! in any geometric progression any term divided by its previous term gives you the common ratio, so .... (2k-4)/(k-4)

asked by Emma on May 18, 2007
7. Maths

A geometric progression has a third term of 20 band sum to infinity which is three times the first term. find the first term.

asked by Tejiri on September 10, 2011
8. arithmetic

An arithmetic n geometric sequence have the same first term 2.with the 2nd term x. the sum of the 3rd term of the AS is equal to the 3rd term of the GS. Give the first 3 terms of both sequences.

asked by simphiwe on February 26, 2012
9. Geometric progression

The second term of a geometric progression is 12 more than the first term given that the common the ratio is half of the first term. Find the third term of the Geometric progression

asked by Anonymous on October 23, 2011
10. Math

a geometric progression has a third term of 20 and a sum to infinity which is three times the first term. find the first term

asked by Dave on May 12, 2016

More Similar Questions