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Finding the Fourth Proportional to 121.92, 168.96 and 120.36

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Solution

The fourth proportional to 121.92, 168.96 and 120.36 is: 166.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.92 : 168.96 = 120.36 : x
  2. Step 2: Convert to fraction form
    121.92/168.96 = 120.36/x
  3. Step 3: Cross multiply
    121.92x = 168.96 × 120.36
  4. Step 4: Simplify right side
    121.92x = 20,336.03
  5. Step 5: Solve for x
    x = 20,336.03/121.92
  6. Step 6: Final answer
    x = 166.80

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.