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Finding the Fourth Proportional to 188.05, 281.67 and 115.78

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Solution

The fourth proportional to 188.05, 281.67 and 115.78 is: 173.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.05 : 281.67 = 115.78 : x
  2. Step 2: Convert to fraction form
    188.05/281.67 = 115.78/x
  3. Step 3: Cross multiply
    188.05x = 281.67 × 115.78
  4. Step 4: Simplify right side
    188.05x = 32,611.75
  5. Step 5: Solve for x
    x = 32,611.75/188.05
  6. Step 6: Final answer
    x = 173.42

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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.