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Finding the Fourth Proportional to 3,691.80, 5,529.60 and 3,281.40

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Solution

The fourth proportional to 3,691.80, 5,529.60 and 3,281.40 is: 4,914.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,691.80 : 5,529.60 = 3,281.40 : x
  2. Step 2: Convert to fraction form
    3,691.80/5,529.60 = 3,281.40/x
  3. Step 3: Cross multiply
    3,691.80x = 5,529.60 × 3,281.40
  4. Step 4: Simplify right side
    3,691.80x = 18,144,829.44
  5. Step 5: Solve for x
    x = 18,144,829.44/3,691.80
  6. Step 6: Final answer
    x = 4,914.90

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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.