If x ∶ 3 ∶∶ y ∶ 9, then the value of y/3x is?
1
The proportion \(x:3::y:9\) means \(\dfrac{x}{3}=\dfrac{y}{9}\). Cross-multiplying:
\[9x=3y \;\Rightarrow\; y=3x\]
Substituting into the target expression:
\[\frac{y}{3x}=\frac{3x}{3x}=1\]
Therefore the value is 1.
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