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Finding the Fourth Proportional to 143.72, 198.23 and 138.96

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Solution

The fourth proportional to 143.72, 198.23 and 138.96 is: 191.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.72 : 198.23 = 138.96 : x
  2. Step 2: Convert to fraction form
    143.72/198.23 = 138.96/x
  3. Step 3: Cross multiply
    143.72x = 198.23 × 138.96
  4. Step 4: Simplify right side
    143.72x = 27,546.04
  5. Step 5: Solve for x
    x = 27,546.04/143.72
  6. Step 6: Final answer
    x = 191.66

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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.