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Finding the Fourth Proportional to 255.78, 385.52 and 220.14

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Solution

The fourth proportional to 255.78, 385.52 and 220.14 is: 331.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.78 : 385.52 = 220.14 : x
  2. Step 2: Convert to fraction form
    255.78/385.52 = 220.14/x
  3. Step 3: Cross multiply
    255.78x = 385.52 × 220.14
  4. Step 4: Simplify right side
    255.78x = 84,867.27
  5. Step 5: Solve for x
    x = 84,867.27/255.78
  6. Step 6: Final answer
    x = 331.80

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.