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Finding the Fourth Proportional to 258.57, 356.67 and 225.90

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Solution

The fourth proportional to 258.57, 356.67 and 225.90 is: 311.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.57 : 356.67 = 225.90 : x
  2. Step 2: Convert to fraction form
    258.57/356.67 = 225.90/x
  3. Step 3: Cross multiply
    258.57x = 356.67 × 225.90
  4. Step 4: Simplify right side
    258.57x = 80,571.75
  5. Step 5: Solve for x
    x = 80,571.75/258.57
  6. Step 6: Final answer
    x = 311.61

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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.