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Finding the Fourth Proportional to 163.38, 225.30 and 121.80

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Solution

The fourth proportional to 163.38, 225.30 and 121.80 is: 167.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.38 : 225.30 = 121.80 : x
  2. Step 2: Convert to fraction form
    163.38/225.30 = 121.80/x
  3. Step 3: Cross multiply
    163.38x = 225.30 × 121.80
  4. Step 4: Simplify right side
    163.38x = 27,441.54
  5. Step 5: Solve for x
    x = 27,441.54/163.38
  6. Step 6: Final answer
    x = 167.96

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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.