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Finding the Fourth Proportional to 258.46, 387.67 and 85.24

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Solution

The fourth proportional to 258.46, 387.67 and 85.24 is: 127.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.46 : 387.67 = 85.24 : x
  2. Step 2: Convert to fraction form
    258.46/387.67 = 85.24/x
  3. Step 3: Cross multiply
    258.46x = 387.67 × 85.24
  4. Step 4: Simplify right side
    258.46x = 33,043.24
  5. Step 5: Solve for x
    x = 33,043.24/258.46
  6. Step 6: Final answer
    x = 127.85

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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.