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Finding the Fourth Proportional to 258.48, 355.86 and 231.66

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Solution

The fourth proportional to 258.48, 355.86 and 231.66 is: 318.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.48 : 355.86 = 231.66 : x
  2. Step 2: Convert to fraction form
    258.48/355.86 = 231.66/x
  3. Step 3: Cross multiply
    258.48x = 355.86 × 231.66
  4. Step 4: Simplify right side
    258.48x = 82,438.53
  5. Step 5: Solve for x
    x = 82,438.53/258.48
  6. Step 6: Final answer
    x = 318.94

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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.