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Finding the Fourth Proportional to 3,911.99, 5,868.94 and 1,138.68

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Solution

The fourth proportional to 3,911.99, 5,868.94 and 1,138.68 is: 1,708.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,911.99 : 5,868.94 = 1,138.68 : x
  2. Step 2: Convert to fraction form
    3,911.99/5,868.94 = 1,138.68/x
  3. Step 3: Cross multiply
    3,911.99x = 5,868.94 × 1,138.68
  4. Step 4: Simplify right side
    3,911.99x = 6,682,859.27
  5. Step 5: Solve for x
    x = 6,682,859.27/3,911.99
  6. Step 6: Final answer
    x = 1,708.30

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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.