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Finding the Fourth Proportional to 143.91, 198.48 and 91.46

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Solution

The fourth proportional to 143.91, 198.48 and 91.46 is: 126.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.91 : 198.48 = 91.46 : x
  2. Step 2: Convert to fraction form
    143.91/198.48 = 91.46/x
  3. Step 3: Cross multiply
    143.91x = 198.48 × 91.46
  4. Step 4: Simplify right side
    143.91x = 18,153.82
  5. Step 5: Solve for x
    x = 18,153.82/143.91
  6. Step 6: Final answer
    x = 126.15

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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.