To solve for \( x \) in the ratio \( \frac{x}{8} = \frac{y}{16} \) when \( y = 3 \), we can set up the equation as follows:
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Substitute \( y \) with 3 in the ratio: \[ \frac{x}{8} = \frac{3}{16} \]
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Cross multiply to solve for \( x \): \[ 16x = 3 \times 8 \] \[ 16x = 24 \]
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Now, divide both sides by 16: \[ x = \frac{24}{16} = \frac{3}{2} = 1.5 \]
Thus, the value of \( x \) is 1.5 units.