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Finding the Third Proportional to 13,781 and 21,851

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Solution

The third proportional to 13,781 and 21,851 is: 34,646.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,781 : 21,851 = 21,851 : x
  2. Step 2: Convert to fraction form
    13,781/21,851 = 21,851/x
  3. Step 3: Cross multiply
    13,781x = 21,851 × 21,851
  4. Step 4: Simplify right side
    13,781x = 477,466,201
  5. Step 5: Solve for x
    x = 477,466,201/13,781
  6. Step 6: Final answer
    x = 34,646.70

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.