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Finding the Fourth Proportional to 3,977.87, 5,968.49 and 2,128.50

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Solution

The fourth proportional to 3,977.87, 5,968.49 and 2,128.50 is: 3,193.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,977.87 : 5,968.49 = 2,128.50 : x
  2. Step 2: Convert to fraction form
    3,977.87/5,968.49 = 2,128.50/x
  3. Step 3: Cross multiply
    3,977.87x = 5,968.49 × 2,128.50
  4. Step 4: Simplify right side
    3,977.87x = 12,703,930.97
  5. Step 5: Solve for x
    x = 12,703,930.97/3,977.87
  6. Step 6: Final answer
    x = 3,193.65

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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.