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Finding the Fourth Proportional to 256.81, 354.48 and 163.61

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Solution

The fourth proportional to 256.81, 354.48 and 163.61 is: 225.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.81 : 354.48 = 163.61 : x
  2. Step 2: Convert to fraction form
    256.81/354.48 = 163.61/x
  3. Step 3: Cross multiply
    256.81x = 354.48 × 163.61
  4. Step 4: Simplify right side
    256.81x = 57,996.47
  5. Step 5: Solve for x
    x = 57,996.47/256.81
  6. Step 6: Final answer
    x = 225.83

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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.