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Finding the Fourth Proportional to 89.52, 122.82 and 87.22

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Solution

The fourth proportional to 89.52, 122.82 and 87.22 is: 119.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.52 : 122.82 = 87.22 : x
  2. Step 2: Convert to fraction form
    89.52/122.82 = 87.22/x
  3. Step 3: Cross multiply
    89.52x = 122.82 × 87.22
  4. Step 4: Simplify right side
    89.52x = 10,712.36
  5. Step 5: Solve for x
    x = 10,712.36/89.52
  6. Step 6: Final answer
    x = 119.66

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.