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Finding the Fourth Proportional to 462.78, 638.58 and 255.78

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Solution

The fourth proportional to 462.78, 638.58 and 255.78 is: 352.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    462.78 : 638.58 = 255.78 : x
  2. Step 2: Convert to fraction form
    462.78/638.58 = 255.78/x
  3. Step 3: Cross multiply
    462.78x = 638.58 × 255.78
  4. Step 4: Simplify right side
    462.78x = 163,335.99
  5. Step 5: Solve for x
    x = 163,335.99/462.78
  6. Step 6: Final answer
    x = 352.95

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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.