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Finding the Fourth Proportional to 90.70, 135.97 and 67.97

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Solution

The fourth proportional to 90.70, 135.97 and 67.97 is: 101.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.70 : 135.97 = 67.97 : x
  2. Step 2: Convert to fraction form
    90.70/135.97 = 67.97/x
  3. Step 3: Cross multiply
    90.70x = 135.97 × 67.97
  4. Step 4: Simplify right side
    90.70x = 9,241.88
  5. Step 5: Solve for x
    x = 9,241.88/90.70
  6. Step 6: Final answer
    x = 101.90

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