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Finding the Third Proportional to 12,912 and 15,472

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Solution

The third proportional to 12,912 and 15,472 is: 18,539.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,912 : 15,472 = 15,472 : x
  2. Step 2: Convert to fraction form
    12,912/15,472 = 15,472/x
  3. Step 3: Cross multiply
    12,912x = 15,472 × 15,472
  4. Step 4: Simplify right side
    12,912x = 239,382,784
  5. Step 5: Solve for x
    x = 239,382,784/12,912
  6. Step 6: Final answer
    x = 18,539.56

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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.