Explicație pas cu pas:
x/7=y/4=>x=7y/4
y/1/1/2=z/1/0.1(6)=>y/2=z/1/(16-1)/90=>y/2=z/1/1/6=>y/2=z\6=>z=6y/2=3y
x^2+y^2+z^2=3344
(7y/4)^2+y^2+(3y)^2=3344
49y^2/16 + y^2 + 9y^2=3344
(49y^2+16y^2+144y^2)/16=3344
209y^2=3344•16
y^2=256
y=+-16
I.y=16 =>x=28 si z=48
II.y=-16=>x=-28 si z=-48
P.S.daca nu ai facut numerele negative,ignora punctul II.