若1a:1b:1c=2:3:4,則a:b:c=______.

若1a:1b:1c=2:3:4,則a:b:c=______.

∵1a:1b:1c=2:3:4,∴設1a=2k,1b=3k,1c=4k(k≠0),∴a=12k,b=13k,c=14k,∴a:b:c=12k:13k:14k=12:13:14.故答案為12:13:14.