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Finding the Fourth Proportional to 90.44, 135.68 and 81.88

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Solution

The fourth proportional to 90.44, 135.68 and 81.88 is: 122.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.44 : 135.68 = 81.88 : x
  2. Step 2: Convert to fraction form
    90.44/135.68 = 81.88/x
  3. Step 3: Cross multiply
    90.44x = 135.68 × 81.88
  4. Step 4: Simplify right side
    90.44x = 11,109.48
  5. Step 5: Solve for x
    x = 11,109.48/90.44
  6. Step 6: Final answer
    x = 122.84

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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.