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Finding the Third Proportional to 13,651 and 20,391

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Solution

The third proportional to 13,651 and 20,391 is: 30,458.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,651 : 20,391 = 20,391 : x
  2. Step 2: Convert to fraction form
    13,651/20,391 = 20,391/x
  3. Step 3: Cross multiply
    13,651x = 20,391 × 20,391
  4. Step 4: Simplify right side
    13,651x = 415,792,881
  5. Step 5: Solve for x
    x = 415,792,881/13,651
  6. Step 6: Final answer
    x = 30,458.79

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.