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Finding the Fourth Proportional to 185.78, 256.36 and 102.88

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Solution

The fourth proportional to 185.78, 256.36 and 102.88 is: 141.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.78 : 256.36 = 102.88 : x
  2. Step 2: Convert to fraction form
    185.78/256.36 = 102.88/x
  3. Step 3: Cross multiply
    185.78x = 256.36 × 102.88
  4. Step 4: Simplify right side
    185.78x = 26,374.32
  5. Step 5: Solve for x
    x = 26,374.32/185.78
  6. Step 6: Final answer
    x = 141.97

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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.