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Is 4.2:1.5 proportional to 12:5

Is 4.2:1.5 proportional to 12:5
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Is 4.2:1.5 proportional to 12:5

User RHelp
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No it is not, because if you cross multiply 12 and 1.5 you'll get 18. But if you cross multiply 5 by 4.2 you'll get 21. And 18 is not equal to 21.
User BuddhistBeast
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