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Finding the Fourth Proportional to 401.97, 558.19 and 398.73

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Solution

The fourth proportional to 401.97, 558.19 and 398.73 is: 553.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.97 : 558.19 = 398.73 : x
  2. Step 2: Convert to fraction form
    401.97/558.19 = 398.73/x
  3. Step 3: Cross multiply
    401.97x = 558.19 × 398.73
  4. Step 4: Simplify right side
    401.97x = 222,566.10
  5. Step 5: Solve for x
    x = 222,566.10/401.97
  6. Step 6: Final answer
    x = 553.69

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.