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Finding the Third Proportional to 276,112 and 391,520

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Solution

The third proportional to 276,112 and 391,520 is: 555,165.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    276,112 : 391,520 = 391,520 : x
  2. Step 2: Convert to fraction form
    276,112/391,520 = 391,520/x
  3. Step 3: Cross multiply
    276,112x = 391,520 × 391,520
  4. Step 4: Simplify right side
    276,112x = 153,287,910,400
  5. Step 5: Solve for x
    x = 153,287,910,400/276,112
  6. Step 6: Final answer
    x = 555,165.70

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Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.