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Finding the Third Proportional to 12,939 and 15,402

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Solution

The third proportional to 12,939 and 15,402 is: 18,333.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,939 : 15,402 = 15,402 : x
  2. Step 2: Convert to fraction form
    12,939/15,402 = 15,402/x
  3. Step 3: Cross multiply
    12,939x = 15,402 × 15,402
  4. Step 4: Simplify right side
    12,939x = 237,221,604
  5. Step 5: Solve for x
    x = 237,221,604/12,939
  6. Step 6: Final answer
    x = 18,333.84

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Why These Related Problems?

These problems maintain the same ratio (1.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.