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Finding the Fourth Proportional to 388.11, 582.17 and 131.61

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Solution

The fourth proportional to 388.11, 582.17 and 131.61 is: 197.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.11 : 582.17 = 131.61 : x
  2. Step 2: Convert to fraction form
    388.11/582.17 = 131.61/x
  3. Step 3: Cross multiply
    388.11x = 582.17 × 131.61
  4. Step 4: Simplify right side
    388.11x = 76,619.39
  5. Step 5: Solve for x
    x = 76,619.39/388.11
  6. Step 6: Final answer
    x = 197.42

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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.