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Finding the Fourth Proportional to 89.20, 133.04 and 80.56

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Solution

The fourth proportional to 89.20, 133.04 and 80.56 is: 120.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.20 : 133.04 = 80.56 : x
  2. Step 2: Convert to fraction form
    89.20/133.04 = 80.56/x
  3. Step 3: Cross multiply
    89.20x = 133.04 × 80.56
  4. Step 4: Simplify right side
    89.20x = 10,717.70
  5. Step 5: Solve for x
    x = 10,717.70/89.20
  6. Step 6: Final answer
    x = 120.15

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.