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Finding the Fourth Proportional to 422.40, 633.18 and 239.72

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Solution

The fourth proportional to 422.40, 633.18 and 239.72 is: 359.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.40 : 633.18 = 239.72 : x
  2. Step 2: Convert to fraction form
    422.40/633.18 = 239.72/x
  3. Step 3: Cross multiply
    422.40x = 633.18 × 239.72
  4. Step 4: Simplify right side
    422.40x = 151,785.91
  5. Step 5: Solve for x
    x = 151,785.91/422.40
  6. Step 6: Final answer
    x = 359.34

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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.