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Finding the Fourth Proportional to 255.20, 382.78 and 163.94

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Solution

The fourth proportional to 255.20, 382.78 and 163.94 is: 245.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.20 : 382.78 = 163.94 : x
  2. Step 2: Convert to fraction form
    255.20/382.78 = 163.94/x
  3. Step 3: Cross multiply
    255.20x = 382.78 × 163.94
  4. Step 4: Simplify right side
    255.20x = 62,752.95
  5. Step 5: Solve for x
    x = 62,752.95/255.20
  6. Step 6: Final answer
    x = 245.90

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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.