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Finding the Fourth Proportional to 89.49, 133.52 and 81.39

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Solution

The fourth proportional to 89.49, 133.52 and 81.39 is: 121.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.49 : 133.52 = 81.39 : x
  2. Step 2: Convert to fraction form
    89.49/133.52 = 81.39/x
  3. Step 3: Cross multiply
    89.49x = 133.52 × 81.39
  4. Step 4: Simplify right side
    89.49x = 10,866.79
  5. Step 5: Solve for x
    x = 10,866.79/89.49
  6. Step 6: Final answer
    x = 121.43

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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.