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Finding the Third Proportional to 420,408 and 651,266

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Solution

The third proportional to 420,408 and 651,266 is: 1,008,894.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,408 : 651,266 = 651,266 : x
  2. Step 2: Convert to fraction form
    420,408/651,266 = 651,266/x
  3. Step 3: Cross multiply
    420,408x = 651,266 × 651,266
  4. Step 4: Simplify right side
    420,408x = 424,147,402,756
  5. Step 5: Solve for x
    x = 424,147,402,756/420,408
  6. Step 6: Final answer
    x = 1,008,894.70

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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.