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Finding the Fourth Proportional to 143.86, 198.46 and 85.61

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Solution

The fourth proportional to 143.86, 198.46 and 85.61 is: 118.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.86 : 198.46 = 85.61 : x
  2. Step 2: Convert to fraction form
    143.86/198.46 = 85.61/x
  3. Step 3: Cross multiply
    143.86x = 198.46 × 85.61
  4. Step 4: Simplify right side
    143.86x = 16,989.73
  5. Step 5: Solve for x
    x = 16,989.73/143.86
  6. Step 6: Final answer
    x = 118.10

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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.