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Finding the Third Proportional to 391.92 and 606.87

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Solution

The third proportional to 391.92 and 606.87 is: 939.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.92 : 606.87 = 606.87 : x
  2. Step 2: Convert to fraction form
    391.92/606.87 = 606.87/x
  3. Step 3: Cross multiply
    391.92x = 606.87 × 606.87
  4. Step 4: Simplify right side
    391.92x = 368,287.78
  5. Step 5: Solve for x
    x = 368,287.78/391.92
  6. Step 6: Final answer
    x = 939.70

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.