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Finding the Fourth Proportional to 3,906.74, 5,391 and 2,138.28

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Solution

The fourth proportional to 3,906.74, 5,391 and 2,138.28 is: 2,950.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,906.74 : 5,391 = 2,138.28 : x
  2. Step 2: Convert to fraction form
    3,906.74/5,391 = 2,138.28/x
  3. Step 3: Cross multiply
    3,906.74x = 5,391 × 2,138.28
  4. Step 4: Simplify right side
    3,906.74x = 11,527,467.48
  5. Step 5: Solve for x
    x = 11,527,467.48/3,906.74
  6. Step 6: Final answer
    x = 2,950.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.