‎6,4,5.5,10.25,23,X

find X???

• 
  X= 60.5
  
  6,4,5.5,10.25,23,X
  
  series will be
  
  6,4,5.5,10.25,23,60.5
  6*1/2 +1=4
  4*2/2+1.5= 5.5
  5.5*3/2 +2= 10.25
  10.25*4/2 +2.5 = 23
  23*5/2+3 = 60.5
• 12 years agoHelpfull: Yes(16) No(0)
• Just a wild guess
  it consists of 2 series
  1)6, 5.5, 23 : 6 x 5.5 - 10 = 23
  2)4, 10.25, x : 4 x 10.25 - 10 = 31
• 12 years agoHelpfull: Yes(6) No(3)