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Finding the Fourth Proportional to 8,631, 11,910.78 and 4,905

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Solution

The fourth proportional to 8,631, 11,910.78 and 4,905 is: 6,768.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,631 : 11,910.78 = 4,905 : x
  2. Step 2: Convert to fraction form
    8,631/11,910.78 = 4,905/x
  3. Step 3: Cross multiply
    8,631x = 11,910.78 × 4,905
  4. Step 4: Simplify right side
    8,631x = 58,422,375.90
  5. Step 5: Solve for x
    x = 58,422,375.90/8,631
  6. Step 6: Final answer
    x = 6,768.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.