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Finding the Fourth Proportional to 258.31, 387.39 and 95.90

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Solution

The fourth proportional to 258.31, 387.39 and 95.90 is: 143.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.31 : 387.39 = 95.90 : x
  2. Step 2: Convert to fraction form
    258.31/387.39 = 95.90/x
  3. Step 3: Cross multiply
    258.31x = 387.39 × 95.90
  4. Step 4: Simplify right side
    258.31x = 37,150.70
  5. Step 5: Solve for x
    x = 37,150.70/258.31
  6. Step 6: Final answer
    x = 143.82

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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.