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Finding the Third Proportional to 260,518 and 391,408

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Solution

The third proportional to 260,518 and 391,408 is: 588,060.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,518 : 391,408 = 391,408 : x
  2. Step 2: Convert to fraction form
    260,518/391,408 = 391,408/x
  3. Step 3: Cross multiply
    260,518x = 391,408 × 391,408
  4. Step 4: Simplify right side
    260,518x = 153,200,222,464
  5. Step 5: Solve for x
    x = 153,200,222,464/260,518
  6. Step 6: Final answer
    x = 588,060.03

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.