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Finding the Fourth Proportional to 91.76, 136.84 and 90.44

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Solution

The fourth proportional to 91.76, 136.84 and 90.44 is: 134.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.76 : 136.84 = 90.44 : x
  2. Step 2: Convert to fraction form
    91.76/136.84 = 90.44/x
  3. Step 3: Cross multiply
    91.76x = 136.84 × 90.44
  4. Step 4: Simplify right side
    91.76x = 12,375.81
  5. Step 5: Solve for x
    x = 12,375.81/91.76
  6. Step 6: Final answer
    x = 134.87

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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.