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Finding the Fourth Proportional to 387.92, 581.68 and 225.92

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Solution

The fourth proportional to 387.92, 581.68 and 225.92 is: 338.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.92 : 581.68 = 225.92 : x
  2. Step 2: Convert to fraction form
    387.92/581.68 = 225.92/x
  3. Step 3: Cross multiply
    387.92x = 581.68 × 225.92
  4. Step 4: Simplify right side
    387.92x = 131,413.15
  5. Step 5: Solve for x
    x = 131,413.15/387.92
  6. Step 6: Final answer
    x = 338.76

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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.