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Finding the Third Proportional to 87,172 and 122,756

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Solution

The third proportional to 87,172 and 122,756 is: 172,865.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,172 : 122,756 = 122,756 : x
  2. Step 2: Convert to fraction form
    87,172/122,756 = 122,756/x
  3. Step 3: Cross multiply
    87,172x = 122,756 × 122,756
  4. Step 4: Simplify right side
    87,172x = 15,069,035,536
  5. Step 5: Solve for x
    x = 15,069,035,536/87,172
  6. Step 6: Final answer
    x = 172,865.55

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.