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Finding the Fourth Proportional to 121.92, 168.39 and 121.11

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Solution

The fourth proportional to 121.92, 168.39 and 121.11 is: 167.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.92 : 168.39 = 121.11 : x
  2. Step 2: Convert to fraction form
    121.92/168.39 = 121.11/x
  3. Step 3: Cross multiply
    121.92x = 168.39 × 121.11
  4. Step 4: Simplify right side
    121.92x = 20,393.71
  5. Step 5: Solve for x
    x = 20,393.71/121.92
  6. Step 6: Final answer
    x = 167.27

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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.