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Finding the Fourth Proportional to 398.60, 550.07 and 243.35

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Solution

The fourth proportional to 398.60, 550.07 and 243.35 is: 335.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.60 : 550.07 = 243.35 : x
  2. Step 2: Convert to fraction form
    398.60/550.07 = 243.35/x
  3. Step 3: Cross multiply
    398.60x = 550.07 × 243.35
  4. Step 4: Simplify right side
    398.60x = 133,855.57
  5. Step 5: Solve for x
    x = 133,855.57/398.60
  6. Step 6: Final answer
    x = 335.82

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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.