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Finding the Fourth Proportional to 3,978.40, 5,962.44 and 1,635.76

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Solution

The fourth proportional to 3,978.40, 5,962.44 and 1,635.76 is: 2,451.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,978.40 : 5,962.44 = 1,635.76 : x
  2. Step 2: Convert to fraction form
    3,978.40/5,962.44 = 1,635.76/x
  3. Step 3: Cross multiply
    3,978.40x = 5,962.44 × 1,635.76
  4. Step 4: Simplify right side
    3,978.40x = 9,753,120.85
  5. Step 5: Solve for x
    x = 9,753,120.85/3,978.40
  6. Step 6: Final answer
    x = 2,451.52

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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.