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Finding the Fourth Proportional to 187.42, 281.40 and 126.40

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Solution

The fourth proportional to 187.42, 281.40 and 126.40 is: 189.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.42 : 281.40 = 126.40 : x
  2. Step 2: Convert to fraction form
    187.42/281.40 = 126.40/x
  3. Step 3: Cross multiply
    187.42x = 281.40 × 126.40
  4. Step 4: Simplify right side
    187.42x = 35,568.96
  5. Step 5: Solve for x
    x = 35,568.96/187.42
  6. Step 6: Final answer
    x = 189.78

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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.