The ratio is simply 720:240. You may wish to simplify that to 3:1.
240, 480 and 720
The common multiples of 15 and 16 are 240, 480, 720 and so on.
It is 88/240 = 11/30.
Yes, they are a 4 to 3 ratio.
The multiples of 120 are an infinite set that starts with 120, 240, 360, 480, 600, 720, 840, 960, 1080, 1200, and so on.
The method I would use is: (720 ÷ 6) × 2 = 240
240
240(720/3 = 240)(1200/5 = 240)
The GCF is 240.
The LCM is 720.
240
LCM(90, 240) = 720
240
240, 480, 720 and so on.
240, 480, 720 and so on.
240, 480, 720 and so on.
240, 480, 720 and so on.