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Finding the Fourth Proportional to 309.83, 427.72 and 239.73

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Solution

The fourth proportional to 309.83, 427.72 and 239.73 is: 330.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.83 : 427.72 = 239.73 : x
  2. Step 2: Convert to fraction form
    309.83/427.72 = 239.73/x
  3. Step 3: Cross multiply
    309.83x = 427.72 × 239.73
  4. Step 4: Simplify right side
    309.83x = 102,533.98
  5. Step 5: Solve for x
    x = 102,533.98/309.83
  6. Step 6: Final answer
    x = 330.94

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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.