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Finding the Fourth Proportional to 408.20, 611.37 and 234.45

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Solution

The fourth proportional to 408.20, 611.37 and 234.45 is: 351.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.20 : 611.37 = 234.45 : x
  2. Step 2: Convert to fraction form
    408.20/611.37 = 234.45/x
  3. Step 3: Cross multiply
    408.20x = 611.37 × 234.45
  4. Step 4: Simplify right side
    408.20x = 143,335.70
  5. Step 5: Solve for x
    x = 143,335.70/408.20
  6. Step 6: Final answer
    x = 351.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.