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Finding the Fourth Proportional to 86.83, 120.11 and 81.73

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Solution

The fourth proportional to 86.83, 120.11 and 81.73 is: 113.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.83 : 120.11 = 81.73 : x
  2. Step 2: Convert to fraction form
    86.83/120.11 = 81.73/x
  3. Step 3: Cross multiply
    86.83x = 120.11 × 81.73
  4. Step 4: Simplify right side
    86.83x = 9,815.88
  5. Step 5: Solve for x
    x = 9,815.88/86.83
  6. Step 6: Final answer
    x = 113.05

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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.