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Finding the Fourth Proportional to 89.43, 134.21 and 66.54

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Solution

The fourth proportional to 89.43, 134.21 and 66.54 is: 99.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.43 : 134.21 = 66.54 : x
  2. Step 2: Convert to fraction form
    89.43/134.21 = 66.54/x
  3. Step 3: Cross multiply
    89.43x = 134.21 × 66.54
  4. Step 4: Simplify right side
    89.43x = 8,930.33
  5. Step 5: Solve for x
    x = 8,930.33/89.43
  6. Step 6: Final answer
    x = 99.86

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.