a/2 = b/3 = c/5 a=2c/5 b=3c/5
2c =3d =5e d=2c/3 e=2c/5
a²+b²+c²+d²+e²=1912
(2c/5)²+(3c/5)²+c²+(2c/3)²+(2c/5)²=1912
4c²/25+9c²/25+c²+4c²/9+4c²/25=1912
17c²/25+c²+4c²/9=1912
153c²+225c²+100c²=430200
478c²=430200
c²=900
c=30
a=2*30/5=12
b=3*30/5=18
d=2*30/3=20
e=2*30/5=12