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Finding the Third Proportional to 172,828 and 261,656

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Solution

The third proportional to 172,828 and 261,656 is: 396,138.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,828 : 261,656 = 261,656 : x
  2. Step 2: Convert to fraction form
    172,828/261,656 = 261,656/x
  3. Step 3: Cross multiply
    172,828x = 261,656 × 261,656
  4. Step 4: Simplify right side
    172,828x = 68,463,862,336
  5. Step 5: Solve for x
    x = 68,463,862,336/172,828
  6. Step 6: Final answer
    x = 396,138.72

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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.