∵y:x=3:2,y:z=5:4,∴y:x:z=15:10:12,设x=10k,y=15k,z=12k,∵x+y+z=111,∴10k+15k+12k=111,∴k=3,∴x=30,y=45,z=36,故答案为: x=30 y=45 z=36 .