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Finding the Fourth Proportional to 91.20, 136.81 and 33.45

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Solution

The fourth proportional to 91.20, 136.81 and 33.45 is: 50.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.20 : 136.81 = 33.45 : x
  2. Step 2: Convert to fraction form
    91.20/136.81 = 33.45/x
  3. Step 3: Cross multiply
    91.20x = 136.81 × 33.45
  4. Step 4: Simplify right side
    91.20x = 4,576.29
  5. Step 5: Solve for x
    x = 4,576.29/91.20
  6. Step 6: Final answer
    x = 50.18

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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.