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Finding the Fourth Proportional to 422.99, 634.61 and 217.70

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Solution

The fourth proportional to 422.99, 634.61 and 217.70 is: 326.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.99 : 634.61 = 217.70 : x
  2. Step 2: Convert to fraction form
    422.99/634.61 = 217.70/x
  3. Step 3: Cross multiply
    422.99x = 634.61 × 217.70
  4. Step 4: Simplify right side
    422.99x = 138,156.73
  5. Step 5: Solve for x
    x = 138,156.73/422.99
  6. Step 6: Final answer
    x = 326.62

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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.