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Finding the Fourth Proportional to 422.93, 634.40 and 191.83

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Solution

The fourth proportional to 422.93, 634.40 and 191.83 is: 287.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.93 : 634.40 = 191.83 : x
  2. Step 2: Convert to fraction form
    422.93/634.40 = 191.83/x
  3. Step 3: Cross multiply
    422.93x = 634.40 × 191.83
  4. Step 4: Simplify right side
    422.93x = 121,695.13
  5. Step 5: Solve for x
    x = 121,695.13/422.93
  6. Step 6: Final answer
    x = 287.74

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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.