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Finding the Fourth Proportional to 141.43, 194.97 and 99.86

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Solution

The fourth proportional to 141.43, 194.97 and 99.86 is: 137.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.43 : 194.97 = 99.86 : x
  2. Step 2: Convert to fraction form
    141.43/194.97 = 99.86/x
  3. Step 3: Cross multiply
    141.43x = 194.97 × 99.86
  4. Step 4: Simplify right side
    141.43x = 19,469.70
  5. Step 5: Solve for x
    x = 19,469.70/141.43
  6. Step 6: Final answer
    x = 137.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.