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Finding the Fourth Proportional to 3,958.40, 5,467.20 and 3,728

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Solution

The fourth proportional to 3,958.40, 5,467.20 and 3,728 is: 5,148.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,958.40 : 5,467.20 = 3,728 : x
  2. Step 2: Convert to fraction form
    3,958.40/5,467.20 = 3,728/x
  3. Step 3: Cross multiply
    3,958.40x = 5,467.20 × 3,728
  4. Step 4: Simplify right side
    3,958.40x = 20,381,721.60
  5. Step 5: Solve for x
    x = 20,381,721.60/3,958.40
  6. Step 6: Final answer
    x = 5,148.98

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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.