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Finding the Fourth Proportional to 3,912.69, 5,868.14 and 1,138.76

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Solution

The fourth proportional to 3,912.69, 5,868.14 and 1,138.76 is: 1,707.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,912.69 : 5,868.14 = 1,138.76 : x
  2. Step 2: Convert to fraction form
    3,912.69/5,868.14 = 1,138.76/x
  3. Step 3: Cross multiply
    3,912.69x = 5,868.14 × 1,138.76
  4. Step 4: Simplify right side
    3,912.69x = 6,682,373.77
  5. Step 5: Solve for x
    x = 6,682,373.77/3,912.69
  6. Step 6: Final answer
    x = 1,707.87

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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.