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Finding the Fourth Proportional to 7,251.28, 10,006.74 and 3,939.28

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Solution

The fourth proportional to 7,251.28, 10,006.74 and 3,939.28 is: 5,436.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,251.28 : 10,006.74 = 3,939.28 : x
  2. Step 2: Convert to fraction form
    7,251.28/10,006.74 = 3,939.28/x
  3. Step 3: Cross multiply
    7,251.28x = 10,006.74 × 3,939.28
  4. Step 4: Simplify right side
    7,251.28x = 39,419,350.75
  5. Step 5: Solve for x
    x = 39,419,350.75/7,251.28
  6. Step 6: Final answer
    x = 5,436.19

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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.