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Finding the Fourth Proportional to 143.80, 198.43 and 81.63

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Solution

The fourth proportional to 143.80, 198.43 and 81.63 is: 112.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.80 : 198.43 = 81.63 : x
  2. Step 2: Convert to fraction form
    143.80/198.43 = 81.63/x
  3. Step 3: Cross multiply
    143.80x = 198.43 × 81.63
  4. Step 4: Simplify right side
    143.80x = 16,197.84
  5. Step 5: Solve for x
    x = 16,197.84/143.80
  6. Step 6: Final answer
    x = 112.64

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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.