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Finding the Fourth Proportional to 187.94, 281.39 and 142.49

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Solution

The fourth proportional to 187.94, 281.39 and 142.49 is: 213.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.94 : 281.39 = 142.49 : x
  2. Step 2: Convert to fraction form
    187.94/281.39 = 142.49/x
  3. Step 3: Cross multiply
    187.94x = 281.39 × 142.49
  4. Step 4: Simplify right side
    187.94x = 40,093.14
  5. Step 5: Solve for x
    x = 40,093.14/187.94
  6. Step 6: Final answer
    x = 213.34

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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.