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Finding the Fourth Proportional to 143.72, 198.16 and 91.92

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Solution

The fourth proportional to 143.72, 198.16 and 91.92 is: 126.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.72 : 198.16 = 91.92 : x
  2. Step 2: Convert to fraction form
    143.72/198.16 = 91.92/x
  3. Step 3: Cross multiply
    143.72x = 198.16 × 91.92
  4. Step 4: Simplify right side
    143.72x = 18,214.87
  5. Step 5: Solve for x
    x = 18,214.87/143.72
  6. Step 6: Final answer
    x = 126.74

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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.