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Finding the Fourth Proportional to 187.94, 281.91 and 85.17

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Solution

The fourth proportional to 187.94, 281.91 and 85.17 is: 127.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.94 : 281.91 = 85.17 : x
  2. Step 2: Convert to fraction form
    187.94/281.91 = 85.17/x
  3. Step 3: Cross multiply
    187.94x = 281.91 × 85.17
  4. Step 4: Simplify right side
    187.94x = 24,010.27
  5. Step 5: Solve for x
    x = 24,010.27/187.94
  6. Step 6: Final answer
    x = 127.76

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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.