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Finding the Fourth Proportional to 398.86, 550.49 and 239.33

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Solution

The fourth proportional to 398.86, 550.49 and 239.33 is: 330.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.86 : 550.49 = 239.33 : x
  2. Step 2: Convert to fraction form
    398.86/550.49 = 239.33/x
  3. Step 3: Cross multiply
    398.86x = 550.49 × 239.33
  4. Step 4: Simplify right side
    398.86x = 131,748.77
  5. Step 5: Solve for x
    x = 131,748.77/398.86
  6. Step 6: Final answer
    x = 330.31

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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.