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Finding the Fourth Proportional to 143.42, 197.90 and 81.25

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Solution

The fourth proportional to 143.42, 197.90 and 81.25 is: 112.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.42 : 197.90 = 81.25 : x
  2. Step 2: Convert to fraction form
    143.42/197.90 = 81.25/x
  3. Step 3: Cross multiply
    143.42x = 197.90 × 81.25
  4. Step 4: Simplify right side
    143.42x = 16,079.24
  5. Step 5: Solve for x
    x = 16,079.24/143.42
  6. Step 6: Final answer
    x = 112.12

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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.