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Finding the Fourth Proportional to 69.20, 103.57 and 53.94

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Solution

The fourth proportional to 69.20, 103.57 and 53.94 is: 80.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.20 : 103.57 = 53.94 : x
  2. Step 2: Convert to fraction form
    69.20/103.57 = 53.94/x
  3. Step 3: Cross multiply
    69.20x = 103.57 × 53.94
  4. Step 4: Simplify right side
    69.20x = 5,586.43
  5. Step 5: Solve for x
    x = 5,586.43/69.20
  6. Step 6: Final answer
    x = 80.73

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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.