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Finding the Third Proportional to 38,587 and 81,911

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Solution

The third proportional to 38,587 and 81,911 is: 173,877.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,587 : 81,911 = 81,911 : x
  2. Step 2: Convert to fraction form
    38,587/81,911 = 81,911/x
  3. Step 3: Cross multiply
    38,587x = 81,911 × 81,911
  4. Step 4: Simplify right side
    38,587x = 6,709,411,921
  5. Step 5: Solve for x
    x = 6,709,411,921/38,587
  6. Step 6: Final answer
    x = 173,877.52

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.