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Finding the Fourth Proportional to 87.73, 120.94 and 87.18

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Solution

The fourth proportional to 87.73, 120.94 and 87.18 is: 120.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.73 : 120.94 = 87.18 : x
  2. Step 2: Convert to fraction form
    87.73/120.94 = 87.18/x
  3. Step 3: Cross multiply
    87.73x = 120.94 × 87.18
  4. Step 4: Simplify right side
    87.73x = 10,543.37
  5. Step 5: Solve for x
    x = 10,543.37/87.73
  6. Step 6: Final answer
    x = 120.18

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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.