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Finding the Fourth Proportional to 408.28, 611.91 and 235.09

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Solution

The fourth proportional to 408.28, 611.91 and 235.09 is: 352.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.28 : 611.91 = 235.09 : x
  2. Step 2: Convert to fraction form
    408.28/611.91 = 235.09/x
  3. Step 3: Cross multiply
    408.28x = 611.91 × 235.09
  4. Step 4: Simplify right side
    408.28x = 143,853.92
  5. Step 5: Solve for x
    x = 143,853.92/408.28
  6. Step 6: Final answer
    x = 352.34

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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.