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Finding the Fourth Proportional to 408.35, 611.99 and 191.48

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Solution

The fourth proportional to 408.35, 611.99 and 191.48 is: 286.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.35 : 611.99 = 191.48 : x
  2. Step 2: Convert to fraction form
    408.35/611.99 = 191.48/x
  3. Step 3: Cross multiply
    408.35x = 611.99 × 191.48
  4. Step 4: Simplify right side
    408.35x = 117,179.83
  5. Step 5: Solve for x
    x = 117,179.83/408.35
  6. Step 6: Final answer
    x = 286.96

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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.