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Finding the Fourth Proportional to 398.97, 550.24 and 315.92

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Solution

The fourth proportional to 398.97, 550.24 and 315.92 is: 435.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.97 : 550.24 = 315.92 : x
  2. Step 2: Convert to fraction form
    398.97/550.24 = 315.92/x
  3. Step 3: Cross multiply
    398.97x = 550.24 × 315.92
  4. Step 4: Simplify right side
    398.97x = 173,832.41
  5. Step 5: Solve for x
    x = 173,832.41/398.97
  6. Step 6: Final answer
    x = 435.70

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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.