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Finding the Fourth Proportional to 398.99, 550.82 and 249.66

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Solution

The fourth proportional to 398.99, 550.82 and 249.66 is: 344.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.99 : 550.82 = 249.66 : x
  2. Step 2: Convert to fraction form
    398.99/550.82 = 249.66/x
  3. Step 3: Cross multiply
    398.99x = 550.82 × 249.66
  4. Step 4: Simplify right side
    398.99x = 137,516.47
  5. Step 5: Solve for x
    x = 137,516.47/398.99
  6. Step 6: Final answer
    x = 344.67

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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.