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Finding the Fourth Proportional to 163.43, 225.28 and 121.92

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Solution

The fourth proportional to 163.43, 225.28 and 121.92 is: 168.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.43 : 225.28 = 121.92 : x
  2. Step 2: Convert to fraction form
    163.43/225.28 = 121.92/x
  3. Step 3: Cross multiply
    163.43x = 225.28 × 121.92
  4. Step 4: Simplify right side
    163.43x = 27,466.14
  5. Step 5: Solve for x
    x = 27,466.14/163.43
  6. Step 6: Final answer
    x = 168.06

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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.