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Finding the Third Proportional to 10,872 and 15,540

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Solution

The third proportional to 10,872 and 15,540 is: 22,212.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,872 : 15,540 = 15,540 : x
  2. Step 2: Convert to fraction form
    10,872/15,540 = 15,540/x
  3. Step 3: Cross multiply
    10,872x = 15,540 × 15,540
  4. Step 4: Simplify right side
    10,872x = 241,491,600
  5. Step 5: Solve for x
    x = 241,491,600/10,872
  6. Step 6: Final answer
    x = 22,212.25

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.