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Finding the Fourth Proportional to 309.38, 427.41 and 239.72

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Solution

The fourth proportional to 309.38, 427.41 and 239.72 is: 331.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.38 : 427.41 = 239.72 : x
  2. Step 2: Convert to fraction form
    309.38/427.41 = 239.72/x
  3. Step 3: Cross multiply
    309.38x = 427.41 × 239.72
  4. Step 4: Simplify right side
    309.38x = 102,458.73
  5. Step 5: Solve for x
    x = 102,458.73/309.38
  6. Step 6: Final answer
    x = 331.17

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.