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Finding the Fourth Proportional to 128.27, 192.61 and 121.77

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Solution

The fourth proportional to 128.27, 192.61 and 121.77 is: 182.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.27 : 192.61 = 121.77 : x
  2. Step 2: Convert to fraction form
    128.27/192.61 = 121.77/x
  3. Step 3: Cross multiply
    128.27x = 192.61 × 121.77
  4. Step 4: Simplify right side
    128.27x = 23,454.12
  5. Step 5: Solve for x
    x = 23,454.12/128.27
  6. Step 6: Final answer
    x = 182.86

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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.