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Finding the Fourth Proportional to 143.46, 197.80 and 140.42

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Solution

The fourth proportional to 143.46, 197.80 and 140.42 is: 193.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.46 : 197.80 = 140.42 : x
  2. Step 2: Convert to fraction form
    143.46/197.80 = 140.42/x
  3. Step 3: Cross multiply
    143.46x = 197.80 × 140.42
  4. Step 4: Simplify right side
    143.46x = 27,775.08
  5. Step 5: Solve for x
    x = 27,775.08/143.46
  6. Step 6: Final answer
    x = 193.61

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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.