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Finding the Fourth Proportional to 85.44, 128.18 and 44.92

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Solution

The fourth proportional to 85.44, 128.18 and 44.92 is: 67.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.44 : 128.18 = 44.92 : x
  2. Step 2: Convert to fraction form
    85.44/128.18 = 44.92/x
  3. Step 3: Cross multiply
    85.44x = 128.18 × 44.92
  4. Step 4: Simplify right side
    85.44x = 5,757.85
  5. Step 5: Solve for x
    x = 5,757.85/85.44
  6. Step 6: Final answer
    x = 67.39

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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.