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Finding the Third Proportional to 13,891 and 21,515

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Solution

The third proportional to 13,891 and 21,515 is: 33,323.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,891 : 21,515 = 21,515 : x
  2. Step 2: Convert to fraction form
    13,891/21,515 = 21,515/x
  3. Step 3: Cross multiply
    13,891x = 21,515 × 21,515
  4. Step 4: Simplify right side
    13,891x = 462,895,225
  5. Step 5: Solve for x
    x = 462,895,225/13,891
  6. Step 6: Final answer
    x = 33,323.39

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.