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Finding the Fourth Proportional to 3,900.80, 5,850.32 and 1,127.44

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Solution

The fourth proportional to 3,900.80, 5,850.32 and 1,127.44 is: 1,690.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,900.80 : 5,850.32 = 1,127.44 : x
  2. Step 2: Convert to fraction form
    3,900.80/5,850.32 = 1,127.44/x
  3. Step 3: Cross multiply
    3,900.80x = 5,850.32 × 1,127.44
  4. Step 4: Simplify right side
    3,900.80x = 6,595,884.78
  5. Step 5: Solve for x
    x = 6,595,884.78/3,900.80
  6. Step 6: Final answer
    x = 1,690.91

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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.