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Finding the Fourth Proportional to 91.18, 136.77 and 81.10

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Solution

The fourth proportional to 91.18, 136.77 and 81.10 is: 121.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.18 : 136.77 = 81.10 : x
  2. Step 2: Convert to fraction form
    91.18/136.77 = 81.10/x
  3. Step 3: Cross multiply
    91.18x = 136.77 × 81.10
  4. Step 4: Simplify right side
    91.18x = 11,092.05
  5. Step 5: Solve for x
    x = 11,092.05/91.18
  6. Step 6: Final answer
    x = 121.65

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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.