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Finding the Fourth Proportional to 90.96, 135.44 and 90.56

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Solution

The fourth proportional to 90.96, 135.44 and 90.56 is: 134.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.96 : 135.44 = 90.56 : x
  2. Step 2: Convert to fraction form
    90.96/135.44 = 90.56/x
  3. Step 3: Cross multiply
    90.96x = 135.44 × 90.56
  4. Step 4: Simplify right side
    90.96x = 12,265.45
  5. Step 5: Solve for x
    x = 12,265.45/90.96
  6. Step 6: Final answer
    x = 134.84

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.