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Finding the Fourth Proportional to 121.32, 166.80 and 111.84

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Solution

The fourth proportional to 121.32, 166.80 and 111.84 is: 153.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.32 : 166.80 = 111.84 : x
  2. Step 2: Convert to fraction form
    121.32/166.80 = 111.84/x
  3. Step 3: Cross multiply
    121.32x = 166.80 × 111.84
  4. Step 4: Simplify right side
    121.32x = 18,654.91
  5. Step 5: Solve for x
    x = 18,654.91/121.32
  6. Step 6: Final answer
    x = 153.77

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.