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Finding the Fourth Proportional to 408.50, 611.70 and 225.69

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Solution

The fourth proportional to 408.50, 611.70 and 225.69 is: 337.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.50 : 611.70 = 225.69 : x
  2. Step 2: Convert to fraction form
    408.50/611.70 = 225.69/x
  3. Step 3: Cross multiply
    408.50x = 611.70 × 225.69
  4. Step 4: Simplify right side
    408.50x = 138,054.57
  5. Step 5: Solve for x
    x = 138,054.57/408.50
  6. Step 6: Final answer
    x = 337.95

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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.