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Finding the Fourth Proportional to 422.99, 634.34 and 162.78

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Solution

The fourth proportional to 422.99, 634.34 and 162.78 is: 244.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.99 : 634.34 = 162.78 : x
  2. Step 2: Convert to fraction form
    422.99/634.34 = 162.78/x
  3. Step 3: Cross multiply
    422.99x = 634.34 × 162.78
  4. Step 4: Simplify right side
    422.99x = 103,257.05
  5. Step 5: Solve for x
    x = 103,257.05/422.99
  6. Step 6: Final answer
    x = 244.12

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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.