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3/10=x/100 what is x

What is x?

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Vivian L. | Microsoft Word/Excel/Outlook, essay composition, math; I LOVE TO TEACHMicrosoft Word/Excel/Outlook, essay comp...
3.0 3.0 (1 lesson ratings) (1)
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Hi Angelica;
The short way, I can see immediately that x=30.
The long way...
3/10=x/100
Let's cross-multiply...
(3)(100)=300
(10)(x)=10x
300=10x
Let's divide both sides by 10...
300/10=10x/10
30=x