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Finding the Fourth Proportional to 143.66, 198.26 and 78.17

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Solution

The fourth proportional to 143.66, 198.26 and 78.17 is: 107.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.66 : 198.26 = 78.17 : x
  2. Step 2: Convert to fraction form
    143.66/198.26 = 78.17/x
  3. Step 3: Cross multiply
    143.66x = 198.26 × 78.17
  4. Step 4: Simplify right side
    143.66x = 15,497.98
  5. Step 5: Solve for x
    x = 15,497.98/143.66
  6. Step 6: Final answer
    x = 107.88

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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.