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Finding the Fourth Proportional to 143.78, 198.25 and 115.83

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Solution

The fourth proportional to 143.78, 198.25 and 115.83 is: 159.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.78 : 198.25 = 115.83 : x
  2. Step 2: Convert to fraction form
    143.78/198.25 = 115.83/x
  3. Step 3: Cross multiply
    143.78x = 198.25 × 115.83
  4. Step 4: Simplify right side
    143.78x = 22,963.01
  5. Step 5: Solve for x
    x = 22,963.01/143.78
  6. Step 6: Final answer
    x = 159.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.