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Finding the Third Proportional to 5,415 and 11,379

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Solution

The third proportional to 5,415 and 11,379 is: 23,911.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,415 : 11,379 = 11,379 : x
  2. Step 2: Convert to fraction form
    5,415/11,379 = 11,379/x
  3. Step 3: Cross multiply
    5,415x = 11,379 × 11,379
  4. Step 4: Simplify right side
    5,415x = 129,481,641
  5. Step 5: Solve for x
    x = 129,481,641/5,415
  6. Step 6: Final answer
    x = 23,911.66

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Why These Related Problems?

These problems maintain the same ratio (2.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.