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Finding the Fourth Proportional to 398.64, 550.38 and 251.22

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Solution

The fourth proportional to 398.64, 550.38 and 251.22 is: 346.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.64 : 550.38 = 251.22 : x
  2. Step 2: Convert to fraction form
    398.64/550.38 = 251.22/x
  3. Step 3: Cross multiply
    398.64x = 550.38 × 251.22
  4. Step 4: Simplify right side
    398.64x = 138,266.46
  5. Step 5: Solve for x
    x = 138,266.46/398.64
  6. Step 6: Final answer
    x = 346.85

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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.