Finding the Third Proportional to 489 and 978
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Solution
The third proportional to 489 and 978 is: 1,956
Step by Step Solution
- Step 1: Write the proportion equation
489 : 978 = 978 : x - Step 2: Convert to fraction form
489/978 = 978/x - Step 3: Cross multiply
489x = 978 × 978 - Step 4: Simplify right side
489x = 956,484 - Step 5: Solve for x
x = 956,484/489 - Step 6: Final answer
x = 1,956
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These problems maintain the same ratio (2) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.