SOLUTION: Plese help me solve this geometric progression if 7,x,y,189 are in G.P Find x and y

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Question 1196576: Plese help me solve this geometric progression if 7,x,y,189 are in G.P Find x and y
Found 3 solutions by greenestamps, math_helper, ewatrrr:
Answer by greenestamps(13200)   (Show Source): You can put this solution on YOUR website!


The 4th term, 189, is the first term, 7, multiplied by the common ratio 3 times:





The common ratio is 3; you can do the simple arithmetic to find x and y.
Answer by math_helper(2461)   (Show Source): You can put this solution on YOUR website!



7 = 

x = 

y = 

189 =   -->   -->  or 



x =  = 21

y =  = 7*9 = 63





So the progression is  7, 21, 63, 189, ...  





 

Answer by ewatrrr(24785)   (Show Source): You can put this solution on YOUR website!
 

Hi


Geometric progression: {7,x,y,189}
  and    |given
Need to Know!

 


7r^3 = 189
or
r^3 = 27
r = 3

x =  = 21
y=  = 63

Wish You the Best in your Studies.
 

   

 

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