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Finding the Fourth Proportional to 408.22, 611.90 and 191.62

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Solution

The fourth proportional to 408.22, 611.90 and 191.62 is: 287.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.22 : 611.90 = 191.62 : x
  2. Step 2: Convert to fraction form
    408.22/611.90 = 191.62/x
  3. Step 3: Cross multiply
    408.22x = 611.90 × 191.62
  4. Step 4: Simplify right side
    408.22x = 117,252.28
  5. Step 5: Solve for x
    x = 117,252.28/408.22
  6. Step 6: Final answer
    x = 287.23

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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.