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Finding the Fourth Proportional to 121.05, 166.82 and 93.42

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Solution

The fourth proportional to 121.05, 166.82 and 93.42 is: 128.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.05 : 166.82 = 93.42 : x
  2. Step 2: Convert to fraction form
    121.05/166.82 = 93.42/x
  3. Step 3: Cross multiply
    121.05x = 166.82 × 93.42
  4. Step 4: Simplify right side
    121.05x = 15,583.86
  5. Step 5: Solve for x
    x = 15,583.86/121.05
  6. Step 6: Final answer
    x = 128.74

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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.