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Finding the Fourth Proportional to 143.11, 213.69 and 115.78

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Solution

The fourth proportional to 143.11, 213.69 and 115.78 is: 172.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.11 : 213.69 = 115.78 : x
  2. Step 2: Convert to fraction form
    143.11/213.69 = 115.78/x
  3. Step 3: Cross multiply
    143.11x = 213.69 × 115.78
  4. Step 4: Simplify right side
    143.11x = 24,739.96
  5. Step 5: Solve for x
    x = 24,739.96/143.11
  6. Step 6: Final answer
    x = 172.87

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.