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Finding the Fourth Proportional to 422, 634.21 and 205.73

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Solution

The fourth proportional to 422, 634.21 and 205.73 is: 309.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    422 : 634.21 = 205.73 : x
  2. Step 2: Convert to fraction form
    422/634.21 = 205.73/x
  3. Step 3: Cross multiply
    422x = 634.21 × 205.73
  4. Step 4: Simplify right side
    422x = 130,476.02
  5. Step 5: Solve for x
    x = 130,476.02/422
  6. Step 6: Final answer
    x = 309.18

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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.