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Finding the Fourth Proportional to 91.12, 136.83 and 90.41

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Solution

The fourth proportional to 91.12, 136.83 and 90.41 is: 135.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.12 : 136.83 = 90.41 : x
  2. Step 2: Convert to fraction form
    91.12/136.83 = 90.41/x
  3. Step 3: Cross multiply
    91.12x = 136.83 × 90.41
  4. Step 4: Simplify right side
    91.12x = 12,369.66
  5. Step 5: Solve for x
    x = 12,369.66/91.12
  6. Step 6: Final answer
    x = 135.76

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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.