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Finding the Fourth Proportional to 422.64, 634.16 and 191.61

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Solution

The fourth proportional to 422.64, 634.16 and 191.61 is: 287.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.64 : 634.16 = 191.61 : x
  2. Step 2: Convert to fraction form
    422.64/634.16 = 191.61/x
  3. Step 3: Cross multiply
    422.64x = 634.16 × 191.61
  4. Step 4: Simplify right side
    422.64x = 121,511.88
  5. Step 5: Solve for x
    x = 121,511.88/422.64
  6. Step 6: Final answer
    x = 287.51

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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.