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Finding the Fourth Proportional to 121.96, 168.60 and 108.28

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Solution

The fourth proportional to 121.96, 168.60 and 108.28 is: 149.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.96 : 168.60 = 108.28 : x
  2. Step 2: Convert to fraction form
    121.96/168.60 = 108.28/x
  3. Step 3: Cross multiply
    121.96x = 168.60 × 108.28
  4. Step 4: Simplify right side
    121.96x = 18,256.01
  5. Step 5: Solve for x
    x = 18,256.01/121.96
  6. Step 6: Final answer
    x = 149.69

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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.