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Finding the Fourth Proportional to 163.26, 225.33 and 121.76

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Solution

The fourth proportional to 163.26, 225.33 and 121.76 is: 168.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.26 : 225.33 = 121.76 : x
  2. Step 2: Convert to fraction form
    163.26/225.33 = 121.76/x
  3. Step 3: Cross multiply
    163.26x = 225.33 × 121.76
  4. Step 4: Simplify right side
    163.26x = 27,435.05
  5. Step 5: Solve for x
    x = 27,435.05/163.26
  6. Step 6: Final answer
    x = 168.05

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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.