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Finding the Fourth Proportional to 128.87, 194.26 and 121.44

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Solution

The fourth proportional to 128.87, 194.26 and 121.44 is: 183.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.87 : 194.26 = 121.44 : x
  2. Step 2: Convert to fraction form
    128.87/194.26 = 121.44/x
  3. Step 3: Cross multiply
    128.87x = 194.26 × 121.44
  4. Step 4: Simplify right side
    128.87x = 23,590.93
  5. Step 5: Solve for x
    x = 23,590.93/128.87
  6. Step 6: Final answer
    x = 183.06

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.