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Finding the Fourth Proportional to 187.72, 281.65 and 85

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Solution

The fourth proportional to 187.72, 281.65 and 85 is: 127.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.72 : 281.65 = 85 : x
  2. Step 2: Convert to fraction form
    187.72/281.65 = 85/x
  3. Step 3: Cross multiply
    187.72x = 281.65 × 85
  4. Step 4: Simplify right side
    187.72x = 23,940.25
  5. Step 5: Solve for x
    x = 23,940.25/187.72
  6. Step 6: Final answer
    x = 127.53

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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.