How do you write 1 is to 2 as 5 is to x

Question

as a proportion in fractional notation?(1 point)
Responses

1:2=5:x
ratio of 1 to 2 equals ratio of 5 to x

1:3::5:x
ratio of 1 to 3 colon colon ratio of 5 to x

21=5x
Start Fraction 2 over 1 End Fraction equals Start Fraction 5 over x End Fraction

12=5x

Answer 1

To express "1 is to 2 as 5 is to x" in fractional notation, you would write it as:

\[ \frac{1}{2} = \frac{5}{x} \]

So the correct response is:

21 = 5x (which appears to have a mistake in the response; it should be \(\frac{1}{2} = \frac{5}{x}\)).

However, none of the options listed here are correct, given that the proper fraction would be \(\frac{1}{2} = \frac{5}{x}\). If we rearranged that for x, it becomes \(2 \cdot 5 = 1 \cdot x\), or \(x = 10\).

In summary, the proper fractional proportion is \(\frac{1}{2} = \frac{5}{x}\).