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Finding the Fourth Proportional to 258.82, 389.19 and 238.66

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Solution

The fourth proportional to 258.82, 389.19 and 238.66 is: 358.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.82 : 389.19 = 238.66 : x
  2. Step 2: Convert to fraction form
    258.82/389.19 = 238.66/x
  3. Step 3: Cross multiply
    258.82x = 389.19 × 238.66
  4. Step 4: Simplify right side
    258.82x = 92,884.09
  5. Step 5: Solve for x
    x = 92,884.09/258.82
  6. Step 6: Final answer
    x = 358.88

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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.