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Finding the Fourth Proportional to 3,318.92, 4,978.64 and 853.73

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Solution

The fourth proportional to 3,318.92, 4,978.64 and 853.73 is: 1,280.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,318.92 : 4,978.64 = 853.73 : x
  2. Step 2: Convert to fraction form
    3,318.92/4,978.64 = 853.73/x
  3. Step 3: Cross multiply
    3,318.92x = 4,978.64 × 853.73
  4. Step 4: Simplify right side
    3,318.92x = 4,250,385.17
  5. Step 5: Solve for x
    x = 4,250,385.17/3,318.92
  6. Step 6: Final answer
    x = 1,280.66

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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.