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Finding the Fourth Proportional to 143.64, 198.20 and 81.48

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Solution

The fourth proportional to 143.64, 198.20 and 81.48 is: 112.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.64 : 198.20 = 81.48 : x
  2. Step 2: Convert to fraction form
    143.64/198.20 = 81.48/x
  3. Step 3: Cross multiply
    143.64x = 198.20 × 81.48
  4. Step 4: Simplify right side
    143.64x = 16,149.34
  5. Step 5: Solve for x
    x = 16,149.34/143.64
  6. Step 6: Final answer
    x = 112.43

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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.