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Finding the Fourth Proportional to 3,269.76, 4,905.46 and 961.28

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Solution

The fourth proportional to 3,269.76, 4,905.46 and 961.28 is: 1,442.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,269.76 : 4,905.46 = 961.28 : x
  2. Step 2: Convert to fraction form
    3,269.76/4,905.46 = 961.28/x
  3. Step 3: Cross multiply
    3,269.76x = 4,905.46 × 961.28
  4. Step 4: Simplify right side
    3,269.76x = 4,715,520.59
  5. Step 5: Solve for x
    x = 4,715,520.59/3,269.76
  6. Step 6: Final answer
    x = 1,442.16

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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.