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Finding the Fourth Proportional to 399.54, 550.91 and 281.48

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Solution

The fourth proportional to 399.54, 550.91 and 281.48 is: 388.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.54 : 550.91 = 281.48 : x
  2. Step 2: Convert to fraction form
    399.54/550.91 = 281.48/x
  3. Step 3: Cross multiply
    399.54x = 550.91 × 281.48
  4. Step 4: Simplify right side
    399.54x = 155,067.39
  5. Step 5: Solve for x
    x = 155,067.39/399.54
  6. Step 6: Final answer
    x = 388.11

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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.