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Finding the Fourth Proportional to 121.27, 181.91 and 111.87

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Solution

The fourth proportional to 121.27, 181.91 and 111.87 is: 167.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.27 : 181.91 = 111.87 : x
  2. Step 2: Convert to fraction form
    121.27/181.91 = 111.87/x
  3. Step 3: Cross multiply
    121.27x = 181.91 × 111.87
  4. Step 4: Simplify right side
    121.27x = 20,350.13
  5. Step 5: Solve for x
    x = 20,350.13/121.27
  6. Step 6: Final answer
    x = 167.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.