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Finding the Fourth Proportional to 121.31, 168.24 and 111.06

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Solution

The fourth proportional to 121.31, 168.24 and 111.06 is: 154.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.31 : 168.24 = 111.06 : x
  2. Step 2: Convert to fraction form
    121.31/168.24 = 111.06/x
  3. Step 3: Cross multiply
    121.31x = 168.24 × 111.06
  4. Step 4: Simplify right side
    121.31x = 18,684.45
  5. Step 5: Solve for x
    x = 18,684.45/121.31
  6. Step 6: Final answer
    x = 154.02

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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.