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Finding the Fourth Proportional to 187.81, 281.29 and 129.91

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Solution

The fourth proportional to 187.81, 281.29 and 129.91 is: 194.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.81 : 281.29 = 129.91 : x
  2. Step 2: Convert to fraction form
    187.81/281.29 = 129.91/x
  3. Step 3: Cross multiply
    187.81x = 281.29 × 129.91
  4. Step 4: Simplify right side
    187.81x = 36,542.38
  5. Step 5: Solve for x
    x = 36,542.38/187.81
  6. Step 6: Final answer
    x = 194.57

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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.