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Finding the Fourth Proportional to 256.81, 354.40 and 140.38

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Solution

The fourth proportional to 256.81, 354.40 and 140.38 is: 193.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.81 : 354.40 = 140.38 : x
  2. Step 2: Convert to fraction form
    256.81/354.40 = 140.38/x
  3. Step 3: Cross multiply
    256.81x = 354.40 × 140.38
  4. Step 4: Simplify right side
    256.81x = 49,750.67
  5. Step 5: Solve for x
    x = 49,750.67/256.81
  6. Step 6: Final answer
    x = 193.73

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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.