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Finding the Third Proportional to 489.56 and 748.69

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Solution

The third proportional to 489.56 and 748.69 is: 1,144.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.56 : 748.69 = 748.69 : x
  2. Step 2: Convert to fraction form
    489.56/748.69 = 748.69/x
  3. Step 3: Cross multiply
    489.56x = 748.69 × 748.69
  4. Step 4: Simplify right side
    489.56x = 560,532.97
  5. Step 5: Solve for x
    x = 560,532.97/489.56
  6. Step 6: Final answer
    x = 1,144.97

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.