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Finding the Fourth Proportional to 309.35, 427.11 and 239.29

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Solution

The fourth proportional to 309.35, 427.11 and 239.29 is: 330.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.35 : 427.11 = 239.29 : x
  2. Step 2: Convert to fraction form
    309.35/427.11 = 239.29/x
  3. Step 3: Cross multiply
    309.35x = 427.11 × 239.29
  4. Step 4: Simplify right side
    309.35x = 102,199.82
  5. Step 5: Solve for x
    x = 102,199.82/309.35
  6. Step 6: Final answer
    x = 330.37

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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.