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Finding the Fourth Proportional to 408.15, 612.21 and 191.97

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Solution

The fourth proportional to 408.15, 612.21 and 191.97 is: 287.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.15 : 612.21 = 191.97 : x
  2. Step 2: Convert to fraction form
    408.15/612.21 = 191.97/x
  3. Step 3: Cross multiply
    408.15x = 612.21 × 191.97
  4. Step 4: Simplify right side
    408.15x = 117,525.95
  5. Step 5: Solve for x
    x = 117,525.95/408.15
  6. Step 6: Final answer
    x = 287.95

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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.