Vous pouvez m’aider svp

bonsoir
220/44=560/x
x=560×44/220
x=56×2
x=112

220/44=x/128
x=128×220/44
x=128×5
x=640

220/44=800/x
x=44×800/220
x=2×80
x=160

220/44=x/91
x=91×220/44
x=91×5
x=455