上式×3
6x+3y-15z = 0
加上下式
9x-16z = 0
因此x：z = 16:9
将z = 9x/16代回任意一式（例如下式）,有
3x - 3y - 9x/16 = 0
解得y = 13x/16,即x：z = 16:13
因此x：y：z = 16:13:9