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Finding the Fourth Proportional to 256.79, 354.17 and 163.45

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Solution

The fourth proportional to 256.79, 354.17 and 163.45 is: 225.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.79 : 354.17 = 163.45 : x
  2. Step 2: Convert to fraction form
    256.79/354.17 = 163.45/x
  3. Step 3: Cross multiply
    256.79x = 354.17 × 163.45
  4. Step 4: Simplify right side
    256.79x = 57,887.38
  5. Step 5: Solve for x
    x = 57,887.38/256.79
  6. Step 6: Final answer
    x = 225.43

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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.