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Finding the Third Proportional to 12,639 and 13,692

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Solution

The third proportional to 12,639 and 13,692 is: 14,832.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,639 : 13,692 = 13,692 : x
  2. Step 2: Convert to fraction form
    12,639/13,692 = 13,692/x
  3. Step 3: Cross multiply
    12,639x = 13,692 × 13,692
  4. Step 4: Simplify right side
    12,639x = 187,470,864
  5. Step 5: Solve for x
    x = 187,470,864/12,639
  6. Step 6: Final answer
    x = 14,832.73

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Why These Related Problems?

These problems maintain the same ratio (1.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.