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Finding the Third Proportional to 270,420 and 420,379

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Solution

The third proportional to 270,420 and 420,379 is: 653,496.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    270,420 : 420,379 = 420,379 : x
  2. Step 2: Convert to fraction form
    270,420/420,379 = 420,379/x
  3. Step 3: Cross multiply
    270,420x = 420,379 × 420,379
  4. Step 4: Simplify right side
    270,420x = 176,718,503,641
  5. Step 5: Solve for x
    x = 176,718,503,641/270,420
  6. Step 6: Final answer
    x = 653,496.43

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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.