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Finding the Fourth Proportional to 256.72, 354.27 and 140.29

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Solution

The fourth proportional to 256.72, 354.27 and 140.29 is: 193.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.72 : 354.27 = 140.29 : x
  2. Step 2: Convert to fraction form
    256.72/354.27 = 140.29/x
  3. Step 3: Cross multiply
    256.72x = 354.27 × 140.29
  4. Step 4: Simplify right side
    256.72x = 49,700.54
  5. Step 5: Solve for x
    x = 49,700.54/256.72
  6. Step 6: Final answer
    x = 193.60

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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.