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Finding the Fourth Proportional to 398.87, 550.22 and 258.79

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Solution

The fourth proportional to 398.87, 550.22 and 258.79 is: 356.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.87 : 550.22 = 258.79 : x
  2. Step 2: Convert to fraction form
    398.87/550.22 = 258.79/x
  3. Step 3: Cross multiply
    398.87x = 550.22 × 258.79
  4. Step 4: Simplify right side
    398.87x = 142,391.43
  5. Step 5: Solve for x
    x = 142,391.43/398.87
  6. Step 6: Final answer
    x = 356.99

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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.