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Finding the Fourth Proportional to 256.76, 385.28 and 112.48

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Solution

The fourth proportional to 256.76, 385.28 and 112.48 is: 168.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.76 : 385.28 = 112.48 : x
  2. Step 2: Convert to fraction form
    256.76/385.28 = 112.48/x
  3. Step 3: Cross multiply
    256.76x = 385.28 × 112.48
  4. Step 4: Simplify right side
    256.76x = 43,336.29
  5. Step 5: Solve for x
    x = 43,336.29/256.76
  6. Step 6: Final answer
    x = 168.78

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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.