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Finding the Fourth Proportional to 69.20, 103.76 and 36.64

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Solution

The fourth proportional to 69.20, 103.76 and 36.64 is: 54.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.20 : 103.76 = 36.64 : x
  2. Step 2: Convert to fraction form
    69.20/103.76 = 36.64/x
  3. Step 3: Cross multiply
    69.20x = 103.76 × 36.64
  4. Step 4: Simplify right side
    69.20x = 3,801.77
  5. Step 5: Solve for x
    x = 3,801.77/69.20
  6. Step 6: Final answer
    x = 54.94

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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.