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Finding the Fourth Proportional to 422.11, 633.18 and 239.63

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Solution

The fourth proportional to 422.11, 633.18 and 239.63 is: 359.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.11 : 633.18 = 239.63 : x
  2. Step 2: Convert to fraction form
    422.11/633.18 = 239.63/x
  3. Step 3: Cross multiply
    422.11x = 633.18 × 239.63
  4. Step 4: Simplify right side
    422.11x = 151,728.92
  5. Step 5: Solve for x
    x = 151,728.92/422.11
  6. Step 6: Final answer
    x = 359.46

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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.