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Finding the Third Proportional to 4,078 and 8,781

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Solution

The third proportional to 4,078 and 8,781 is: 18,907.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,078 : 8,781 = 8,781 : x
  2. Step 2: Convert to fraction form
    4,078/8,781 = 8,781/x
  3. Step 3: Cross multiply
    4,078x = 8,781 × 8,781
  4. Step 4: Simplify right side
    4,078x = 77,105,961
  5. Step 5: Solve for x
    x = 77,105,961/4,078
  6. Step 6: Final answer
    x = 18,907.79

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.