The whole point of the system of European paper sizes is that all have exactly the same ratio. So, theoretically, you can print an A3 document on an A4 sheet and it will not be distorted — it will simply be smaller.
Practically, however, I cannot seem to find a way to do this on Linux Mint, Libre Office Writer 4.2.
How can I print a larger document on a smaller paper size in LibreOffice Writer?