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Finding the Fourth Proportional to 258.78, 357.49 and 239.34

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Solution

The fourth proportional to 258.78, 357.49 and 239.34 is: 330.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.78 : 357.49 = 239.34 : x
  2. Step 2: Convert to fraction form
    258.78/357.49 = 239.34/x
  3. Step 3: Cross multiply
    258.78x = 357.49 × 239.34
  4. Step 4: Simplify right side
    258.78x = 85,561.66
  5. Step 5: Solve for x
    x = 85,561.66/258.78
  6. Step 6: Final answer
    x = 330.63

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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.