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Finding the Fourth Proportional to 3,906.80, 5,391.48 and 2,138.50

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Solution

The fourth proportional to 3,906.80, 5,391.48 and 2,138.50 is: 2,951.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,906.80 : 5,391.48 = 2,138.50 : x
  2. Step 2: Convert to fraction form
    3,906.80/5,391.48 = 2,138.50/x
  3. Step 3: Cross multiply
    3,906.80x = 5,391.48 × 2,138.50
  4. Step 4: Simplify right side
    3,906.80x = 11,529,679.98
  5. Step 5: Solve for x
    x = 11,529,679.98/3,906.80
  6. Step 6: Final answer
    x = 2,951.18

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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.