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Finding the Fourth Proportional to 398.87, 550.33 and 233.12

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Solution

The fourth proportional to 398.87, 550.33 and 233.12 is: 321.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.87 : 550.33 = 233.12 : x
  2. Step 2: Convert to fraction form
    398.87/550.33 = 233.12/x
  3. Step 3: Cross multiply
    398.87x = 550.33 × 233.12
  4. Step 4: Simplify right side
    398.87x = 128,294.60
  5. Step 5: Solve for x
    x = 128,294.60/398.87
  6. Step 6: Final answer
    x = 321.65

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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.