To determine which ratio is equivalent to 978, we should simplify or convert each of the provided options into a numerical form to see which one equals 978.
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326: This is simply 326, which is not equal to 978.
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Start Fraction 3 over 26 End Fraction: \[ \frac{3}{26} = 0.115384615 \quad \text{(approximately)} \]
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18 Start Fraction 1 over 8 End Fraction: \[ 18 \cdot \frac{1}{8} = \frac{18}{8} = 2.25 \]
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13 Start Fraction 1 over 3 End Fraction: \[ 13 \cdot \frac{1}{3} = \frac{13}{3} \approx 4.33333333 \]
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318 Start Fraction 3 over 18 End Fraction: \[ 318 \cdot \frac{3}{18} = 318 \cdot \frac{1}{6} = \frac{318}{6} = 53 \]
None of the options directly equals 978, so let's resolve which ones can be processed further:
Now let's check for equivalent ratios to see if we can express 978 in a similar format:
Since the numbers aren't yielding any results close to 978, it appears that there's confusion since none of these options are equivalent to 978.
Please verify if there is a specific reference limit or further elaboration about how you would like to define equivalence in this situation.