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Finding the Fourth Proportional to 422.58, 634.17 and 191.49

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Solution

The fourth proportional to 422.58, 634.17 and 191.49 is: 287.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.58 : 634.17 = 191.49 : x
  2. Step 2: Convert to fraction form
    422.58/634.17 = 191.49/x
  3. Step 3: Cross multiply
    422.58x = 634.17 × 191.49
  4. Step 4: Simplify right side
    422.58x = 121,437.21
  5. Step 5: Solve for x
    x = 121,437.21/422.58
  6. Step 6: Final answer
    x = 287.37

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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.