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Finding the Fourth Proportional to 143.11, 197.40 and 106.30

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Solution

The fourth proportional to 143.11, 197.40 and 106.30 is: 146.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.11 : 197.40 = 106.30 : x
  2. Step 2: Convert to fraction form
    143.11/197.40 = 106.30/x
  3. Step 3: Cross multiply
    143.11x = 197.40 × 106.30
  4. Step 4: Simplify right side
    143.11x = 20,983.62
  5. Step 5: Solve for x
    x = 20,983.62/143.11
  6. Step 6: Final answer
    x = 146.63

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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.