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Finding the Third Proportional to 12,639 and 18,429

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Solution

The third proportional to 12,639 and 18,429 is: 26,871.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,639 : 18,429 = 18,429 : x
  2. Step 2: Convert to fraction form
    12,639/18,429 = 18,429/x
  3. Step 3: Cross multiply
    12,639x = 18,429 × 18,429
  4. Step 4: Simplify right side
    12,639x = 339,628,041
  5. Step 5: Solve for x
    x = 339,628,041/12,639
  6. Step 6: Final answer
    x = 26,871.43

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.