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Finding the Third Proportional to 280,432 and 423,992

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Solution

The third proportional to 280,432 and 423,992 is: 641,043.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,432 : 423,992 = 423,992 : x
  2. Step 2: Convert to fraction form
    280,432/423,992 = 423,992/x
  3. Step 3: Cross multiply
    280,432x = 423,992 × 423,992
  4. Step 4: Simplify right side
    280,432x = 179,769,216,064
  5. Step 5: Solve for x
    x = 179,769,216,064/280,432
  6. Step 6: Final answer
    x = 641,043.88

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.