[Sstaceyrae21]

A chemist has samples of 2 compounds(ClXa and ClXb), each contain Cl and the element X. She then determines that the ratio of mass X to mass CL.  = 0.5359 for the ClXa and 1.6077 for the Clxb sample. Identify the mystery element "X". 
  I see that my it should be ClX1 and ClX3  just from simple division, but how do I figure waht element X is?

[AWK]

M_X:M_Cl=0.5359 or 3M_X:M_Cl=1.6077
You know M_Cl from a Periodic table
What is M_X