Floats and Doubles

[Juan Ignacio Garcia Garcia]

hello,
I have been using some of the functions of the classes Real and 
Fractional and I have observed that with the funcion "toRational" we can 
obtain the fraction that represents a given number. For instance:
*P2> toRational (5.2::Float)
5452595 % 1048576
Why we obtain this numbers instead of "52 % 10" or "26 % 5"?
I have also obtained the following results with the functions 
"fromRational" and "toRational":
*P2> (fromRational ((toRational 4) - ( toRational (5.2::Float) )))::Double
-1.1999998092651367
*P2> (fromRational ((toRational 4) - ( toRational (5.2::Double) )))::Double
-1.2000000000000002
*P2> (fromRational ((toRational 4) - ( toRational 5.2 )))
-1.2000000000000002
*P2> (fromRational ((toRational 4) - ( toRational (5.2::Float) )))::Float
-1.1999998
Are all these results ok? If this is the case, why?

Thanks,

Ignacio