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Finding the Third Proportional to 12,690 and 15,498

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Solution

The third proportional to 12,690 and 15,498 is: 18,927.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,690 : 15,498 = 15,498 : x
  2. Step 2: Convert to fraction form
    12,690/15,498 = 15,498/x
  3. Step 3: Cross multiply
    12,690x = 15,498 × 15,498
  4. Step 4: Simplify right side
    12,690x = 240,188,004
  5. Step 5: Solve for x
    x = 240,188,004/12,690
  6. Step 6: Final answer
    x = 18,927.34

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Why These Related Problems?

These problems maintain the same ratio (1.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.