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Finding the Fourth Proportional to 90.56, 135.90 and 68.92

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Solution

The fourth proportional to 90.56, 135.90 and 68.92 is: 103.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.56 : 135.90 = 68.92 : x
  2. Step 2: Convert to fraction form
    90.56/135.90 = 68.92/x
  3. Step 3: Cross multiply
    90.56x = 135.90 × 68.92
  4. Step 4: Simplify right side
    90.56x = 9,365.20
  5. Step 5: Solve for x
    x = 9,365.20/90.56
  6. Step 6: Final answer
    x = 103.42

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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.