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Finding the Fourth Proportional to 121.78, 182.72 and 115.93

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Solution

The fourth proportional to 121.78, 182.72 and 115.93 is: 173.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.78 : 182.72 = 115.93 : x
  2. Step 2: Convert to fraction form
    121.78/182.72 = 115.93/x
  3. Step 3: Cross multiply
    121.78x = 182.72 × 115.93
  4. Step 4: Simplify right side
    121.78x = 21,182.73
  5. Step 5: Solve for x
    x = 21,182.73/121.78
  6. Step 6: Final answer
    x = 173.94

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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.