The fourth proportional to 5, 8, 15 is:

A. 18 B. 24
C. 19 D. 20

• 5:8:15:x
  so x= 8*15/5
  =24
• 11 years agoHelpfull: Yes(8) No(1)
• 8*15=5*x=>x=(8*15)/5=24. ans
• 10 years agoHelpfull: Yes(1) No(0)
• 5.8..15.x
  24
• 9 years agoHelpfull: Yes(1) No(1)
• 5*3=15 8*3=24
• 9 years agoHelpfull: Yes(0) No(0)
• Here four terms are in proportion
  5:8:15:x(the unknown 4th term)
  5*x=8*15(By using the proportion formula i.e.,Product of extremes=Product of mean terms)
  x=8*15/5=24.
• 9 years agoHelpfull: Yes(0) No(0)
• B.24
  5/8=15/x
  x=24
• 9 years agoHelpfull: Yes(0) No(0)
• 5*3= 15
  8*3=24
• 6 years agoHelpfull: Yes(0) No(0)