It depends on how big your original sheets are.
If you are already large then blowing them up full size, by a factor of about 4, does risk distortion in copying. The paper comes on a roll and can stretch as it goes through. Sheets would also be a pig to handle.
Personally, I have found it easy to measure from the plan with dividers (for accuracy), and then use a calculator to convert to the new measurement. Once you have worked out your multiplication ratio (r) it is as easy as:
length x r where (for your case) r = 100/24 = 4.166666
You can also buy or make proportional/scale dividers, as the fulcrum is not at the centre if you measure at one end, they are wider at the other by the correct amount. Some scale dividers are adjustable. You could even make your own custom pair fixed to this scale. You can get really accurate architect's grade, but they are expensive.
There are also scale rulers, a bit difficult to describe, but they basically have six scales, they are popular with some of the railway modellers.
I am sure others have their methods and will add to the list.
