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Finding the Third Proportional to 38,428.50 and 81,411

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Solution

The third proportional to 38,428.50 and 81,411 is: 172,469.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,428.50 : 81,411 = 81,411 : x
  2. Step 2: Convert to fraction form
    38,428.50/81,411 = 81,411/x
  3. Step 3: Cross multiply
    38,428.50x = 81,411 × 81,411
  4. Step 4: Simplify right side
    38,428.50x = 6,627,750,921
  5. Step 5: Solve for x
    x = 6,627,750,921/38,428.50
  6. Step 6: Final answer
    x = 172,469.68

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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.