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Finding the Fourth Proportional to 408.65, 611.91 and 225.66

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Solution

The fourth proportional to 408.65, 611.91 and 225.66 is: 337.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.65 : 611.91 = 225.66 : x
  2. Step 2: Convert to fraction form
    408.65/611.91 = 225.66/x
  3. Step 3: Cross multiply
    408.65x = 611.91 × 225.66
  4. Step 4: Simplify right side
    408.65x = 138,083.61
  5. Step 5: Solve for x
    x = 138,083.61/408.65
  6. Step 6: Final answer
    x = 337.91

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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.