scaleFloat package:dimensional

scaleFloat :: RealFloat a => Int -> Quantity d a -> Quantity d a
dimensional Numeric.Units.Dimensional.Float
Multiplies a floating-point quantity by an integer power of the radix of the representation type. Use floatRadix to determine the radix. 
>>> let x = 3 *~ meter

>>> scaleFloat 3 x
24.0 m
scaleFloat :: RealFloat a => Int -> a -> a
dimensional Numeric.Units.Dimensional.Prelude
multiplies a floating-point number by an integer power of the radix