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Finding the Fourth Proportional to 89.97, 124.20 and 87.54

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Solution

The fourth proportional to 89.97, 124.20 and 87.54 is: 120.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.97 : 124.20 = 87.54 : x
  2. Step 2: Convert to fraction form
    89.97/124.20 = 87.54/x
  3. Step 3: Cross multiply
    89.97x = 124.20 × 87.54
  4. Step 4: Simplify right side
    89.97x = 10,872.47
  5. Step 5: Solve for x
    x = 10,872.47/89.97
  6. Step 6: Final answer
    x = 120.85

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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.