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Finding the Fourth Proportional to 120.75, 166.77 and 81.87

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Solution

The fourth proportional to 120.75, 166.77 and 81.87 is: 113.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.75 : 166.77 = 81.87 : x
  2. Step 2: Convert to fraction form
    120.75/166.77 = 81.87/x
  3. Step 3: Cross multiply
    120.75x = 166.77 × 81.87
  4. Step 4: Simplify right side
    120.75x = 13,653.66
  5. Step 5: Solve for x
    x = 13,653.66/120.75
  6. Step 6: Final answer
    x = 113.07

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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.