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Finding the Third Proportional to 445,692 and 690,408

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Solution

The third proportional to 445,692 and 690,408 is: 1,069,490.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    445,692 : 690,408 = 690,408 : x
  2. Step 2: Convert to fraction form
    445,692/690,408 = 690,408/x
  3. Step 3: Cross multiply
    445,692x = 690,408 × 690,408
  4. Step 4: Simplify right side
    445,692x = 476,663,206,464
  5. Step 5: Solve for x
    x = 476,663,206,464/445,692
  6. Step 6: Final answer
    x = 1,069,490.16

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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.