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Finding the Third Proportional to 18,515 and 27,121

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Solution

The third proportional to 18,515 and 27,121 is: 39,727.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,515 : 27,121 = 27,121 : x
  2. Step 2: Convert to fraction form
    18,515/27,121 = 27,121/x
  3. Step 3: Cross multiply
    18,515x = 27,121 × 27,121
  4. Step 4: Simplify right side
    18,515x = 735,548,641
  5. Step 5: Solve for x
    x = 735,548,641/18,515
  6. Step 6: Final answer
    x = 39,727.17

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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.