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According to Means-extremes Property of proportion: If $\"\"$ , then $\"\"$ \ \

$\"\"$ (Cross products)

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$\"\"$ (Multiply: $\"\"$ )

$\"\"$ (Divide each side by 4.5)

$\"\"$ (Cancel common terms)

$\"\"$ (Divide: $\"\"$ )

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The value of . $\"\"$