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Finding the Third Proportional to 391,839 and 860,739

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Solution

The third proportional to 391,839 and 860,739 is: 1,890,755.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,839 : 860,739 = 860,739 : x
  2. Step 2: Convert to fraction form
    391,839/860,739 = 860,739/x
  3. Step 3: Cross multiply
    391,839x = 860,739 × 860,739
  4. Step 4: Simplify right side
    391,839x = 740,871,626,121
  5. Step 5: Solve for x
    x = 740,871,626,121/391,839
  6. Step 6: Final answer
    x = 1,890,755.20

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.