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Finding the Third Proportional to 20,379 and 29,640

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Solution

The third proportional to 20,379 and 29,640 is: 43,109.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,379 : 29,640 = 29,640 : x
  2. Step 2: Convert to fraction form
    20,379/29,640 = 29,640/x
  3. Step 3: Cross multiply
    20,379x = 29,640 × 29,640
  4. Step 4: Simplify right side
    20,379x = 878,529,600
  5. Step 5: Solve for x
    x = 878,529,600/20,379
  6. Step 6: Final answer
    x = 43,109.55

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.