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Finding the Third Proportional to 13,639 and 20,855

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Solution

The third proportional to 13,639 and 20,855 is: 31,888.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,639 : 20,855 = 20,855 : x
  2. Step 2: Convert to fraction form
    13,639/20,855 = 20,855/x
  3. Step 3: Cross multiply
    13,639x = 20,855 × 20,855
  4. Step 4: Simplify right side
    13,639x = 434,931,025
  5. Step 5: Solve for x
    x = 434,931,025/13,639
  6. Step 6: Final answer
    x = 31,888.78

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.