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Finding the Fourth Proportional to 256.92, 354.55 and 140.48

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Solution

The fourth proportional to 256.92, 354.55 and 140.48 is: 193.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.92 : 354.55 = 140.48 : x
  2. Step 2: Convert to fraction form
    256.92/354.55 = 140.48/x
  3. Step 3: Cross multiply
    256.92x = 354.55 × 140.48
  4. Step 4: Simplify right side
    256.92x = 49,809.04
  5. Step 5: Solve for x
    x = 49,809.04/256.92
  6. Step 6: Final answer
    x = 193.87

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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.