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Finding the Fourth Proportional to 69.12, 103.52 and 49.92

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Solution

The fourth proportional to 69.12, 103.52 and 49.92 is: 74.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.12 : 103.52 = 49.92 : x
  2. Step 2: Convert to fraction form
    69.12/103.52 = 49.92/x
  3. Step 3: Cross multiply
    69.12x = 103.52 × 49.92
  4. Step 4: Simplify right side
    69.12x = 5,167.72
  5. Step 5: Solve for x
    x = 5,167.72/69.12
  6. Step 6: Final answer
    x = 74.76

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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.