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Finding the Fourth Proportional to 187.95, 281.79 and 85.17

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Solution

The fourth proportional to 187.95, 281.79 and 85.17 is: 127.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.95 : 281.79 = 85.17 : x
  2. Step 2: Convert to fraction form
    187.95/281.79 = 85.17/x
  3. Step 3: Cross multiply
    187.95x = 281.79 × 85.17
  4. Step 4: Simplify right side
    187.95x = 24,000.05
  5. Step 5: Solve for x
    x = 24,000.05/187.95
  6. Step 6: Final answer
    x = 127.69

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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.