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Finding the Fourth Proportional to 255.78, 353.34 and 193.86

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Solution

The fourth proportional to 255.78, 353.34 and 193.86 is: 267.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.78 : 353.34 = 193.86 : x
  2. Step 2: Convert to fraction form
    255.78/353.34 = 193.86/x
  3. Step 3: Cross multiply
    255.78x = 353.34 × 193.86
  4. Step 4: Simplify right side
    255.78x = 68,498.49
  5. Step 5: Solve for x
    x = 68,498.49/255.78
  6. Step 6: Final answer
    x = 267.80

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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.