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Finding the Third Proportional to 12,405 and 20,349

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Solution

The third proportional to 12,405 and 20,349 is: 33,380.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,405 : 20,349 = 20,349 : x
  2. Step 2: Convert to fraction form
    12,405/20,349 = 20,349/x
  3. Step 3: Cross multiply
    12,405x = 20,349 × 20,349
  4. Step 4: Simplify right side
    12,405x = 414,081,801
  5. Step 5: Solve for x
    x = 414,081,801/12,405
  6. Step 6: Final answer
    x = 33,380.23

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Why These Related Problems?

These problems maintain the same ratio (1.64) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.