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Finding the Fourth Proportional to 3,453.67, 5,179.60 and 987.91

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Solution

The fourth proportional to 3,453.67, 5,179.60 and 987.91 is: 1,481.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,453.67 : 5,179.60 = 987.91 : x
  2. Step 2: Convert to fraction form
    3,453.67/5,179.60 = 987.91/x
  3. Step 3: Cross multiply
    3,453.67x = 5,179.60 × 987.91
  4. Step 4: Simplify right side
    3,453.67x = 5,116,974.90
  5. Step 5: Solve for x
    x = 5,116,974.90/3,453.67
  6. Step 6: Final answer
    x = 1,481.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.