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Finding the Fourth Proportional to 143.72, 198.38 and 91.24

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Solution

The fourth proportional to 143.72, 198.38 and 91.24 is: 125.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.72 : 198.38 = 91.24 : x
  2. Step 2: Convert to fraction form
    143.72/198.38 = 91.24/x
  3. Step 3: Cross multiply
    143.72x = 198.38 × 91.24
  4. Step 4: Simplify right side
    143.72x = 18,099.24
  5. Step 5: Solve for x
    x = 18,099.24/143.72
  6. Step 6: Final answer
    x = 125.94

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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.