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Finding the Fourth Proportional to 120.40, 166.17 and 87.73

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Solution

The fourth proportional to 120.40, 166.17 and 87.73 is: 121.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.40 : 166.17 = 87.73 : x
  2. Step 2: Convert to fraction form
    120.40/166.17 = 87.73/x
  3. Step 3: Cross multiply
    120.40x = 166.17 × 87.73
  4. Step 4: Simplify right side
    120.40x = 14,578.09
  5. Step 5: Solve for x
    x = 14,578.09/120.40
  6. Step 6: Final answer
    x = 121.08

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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.