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Finding the Fourth Proportional to 187.92, 281.96 and 66.20

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Solution

The fourth proportional to 187.92, 281.96 and 66.20 is: 99.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.92 : 281.96 = 66.20 : x
  2. Step 2: Convert to fraction form
    187.92/281.96 = 66.20/x
  3. Step 3: Cross multiply
    187.92x = 281.96 × 66.20
  4. Step 4: Simplify right side
    187.92x = 18,665.75
  5. Step 5: Solve for x
    x = 18,665.75/187.92
  6. Step 6: Final answer
    x = 99.33

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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.