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Finding the Fourth Proportional to 422.10, 631.94 and 239.18

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Solution

The fourth proportional to 422.10, 631.94 and 239.18 is: 358.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.10 : 631.94 = 239.18 : x
  2. Step 2: Convert to fraction form
    422.10/631.94 = 239.18/x
  3. Step 3: Cross multiply
    422.10x = 631.94 × 239.18
  4. Step 4: Simplify right side
    422.10x = 151,143.05
  5. Step 5: Solve for x
    x = 151,143.05/422.10
  6. Step 6: Final answer
    x = 358.07

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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.