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Numarul x pentru care tripletele (3,x,4) si (9,15,12) sunt direct proportionale


Răspuns :

3/9=x/15=4/12, 3/9=x/15, x=3•15/9, x=5
3/9=x/15=4/12⇔3/9=x/15⇔9x=15*3
9x=45
x=45:9
x=5    

x/15=4/12⇔12x=15*4
12x=60
x=60:12
x=5