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Finding the Fourth Proportional to 89.44, 134.15 and 55.21

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Solution

The fourth proportional to 89.44, 134.15 and 55.21 is: 82.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.44 : 134.15 = 55.21 : x
  2. Step 2: Convert to fraction form
    89.44/134.15 = 55.21/x
  3. Step 3: Cross multiply
    89.44x = 134.15 × 55.21
  4. Step 4: Simplify right side
    89.44x = 7,406.42
  5. Step 5: Solve for x
    x = 7,406.42/89.44
  6. Step 6: Final answer
    x = 82.81

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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.