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Finding the Fourth Proportional to 143.85, 198.50 and 81.68

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Solution

The fourth proportional to 143.85, 198.50 and 81.68 is: 112.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.85 : 198.50 = 81.68 : x
  2. Step 2: Convert to fraction form
    143.85/198.50 = 81.68/x
  3. Step 3: Cross multiply
    143.85x = 198.50 × 81.68
  4. Step 4: Simplify right side
    143.85x = 16,213.48
  5. Step 5: Solve for x
    x = 16,213.48/143.85
  6. Step 6: Final answer
    x = 112.71

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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.