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Finding the Fourth Proportional to 187.91, 281.86 and 85.17

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Solution

The fourth proportional to 187.91, 281.86 and 85.17 is: 127.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.91 : 281.86 = 85.17 : x
  2. Step 2: Convert to fraction form
    187.91/281.86 = 85.17/x
  3. Step 3: Cross multiply
    187.91x = 281.86 × 85.17
  4. Step 4: Simplify right side
    187.91x = 24,005.59
  5. Step 5: Solve for x
    x = 24,005.59/187.91
  6. Step 6: Final answer
    x = 127.75

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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.