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Finding the Fourth Proportional to 256.87, 385.25 and 92.31

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Solution

The fourth proportional to 256.87, 385.25 and 92.31 is: 138.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.87 : 385.25 = 92.31 : x
  2. Step 2: Convert to fraction form
    256.87/385.25 = 92.31/x
  3. Step 3: Cross multiply
    256.87x = 385.25 × 92.31
  4. Step 4: Simplify right side
    256.87x = 35,560.50
  5. Step 5: Solve for x
    x = 35,560.50/256.87
  6. Step 6: Final answer
    x = 138.44

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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.