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Finding the Third Proportional to 12,780 and 15,372

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Solution

The third proportional to 12,780 and 15,372 is: 18,489.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,780 : 15,372 = 15,372 : x
  2. Step 2: Convert to fraction form
    12,780/15,372 = 15,372/x
  3. Step 3: Cross multiply
    12,780x = 15,372 × 15,372
  4. Step 4: Simplify right side
    12,780x = 236,298,384
  5. Step 5: Solve for x
    x = 236,298,384/12,780
  6. Step 6: Final answer
    x = 18,489.70

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Why These Related Problems?

These problems maintain the same ratio (1.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.