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Finding the Fourth Proportional to 399.26, 547.38 and 391.97

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Solution

The fourth proportional to 399.26, 547.38 and 391.97 is: 537.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.26 : 547.38 = 391.97 : x
  2. Step 2: Convert to fraction form
    399.26/547.38 = 391.97/x
  3. Step 3: Cross multiply
    399.26x = 547.38 × 391.97
  4. Step 4: Simplify right side
    399.26x = 214,552.33
  5. Step 5: Solve for x
    x = 214,552.33/399.26
  6. Step 6: Final answer
    x = 537.38

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.