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Finding the Third Proportional to 13,689 and 20,631

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Solution

The third proportional to 13,689 and 20,631 is: 31,093.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,689 : 20,631 = 20,631 : x
  2. Step 2: Convert to fraction form
    13,689/20,631 = 20,631/x
  3. Step 3: Cross multiply
    13,689x = 20,631 × 20,631
  4. Step 4: Simplify right side
    13,689x = 425,638,161
  5. Step 5: Solve for x
    x = 425,638,161/13,689
  6. Step 6: Final answer
    x = 31,093.44

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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.