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Finding the Fourth Proportional to 3,989.62, 5,978.88 and 2,037.70

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Solution

The fourth proportional to 3,989.62, 5,978.88 and 2,037.70 is: 3,053.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.62 : 5,978.88 = 2,037.70 : x
  2. Step 2: Convert to fraction form
    3,989.62/5,978.88 = 2,037.70/x
  3. Step 3: Cross multiply
    3,989.62x = 5,978.88 × 2,037.70
  4. Step 4: Simplify right side
    3,989.62x = 12,183,163.78
  5. Step 5: Solve for x
    x = 12,183,163.78/3,989.62
  6. Step 6: Final answer
    x = 3,053.72

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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.