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Finding the Fourth Proportional to 69.20, 103.74 and 42.18

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Solution

The fourth proportional to 69.20, 103.74 and 42.18 is: 63.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.20 : 103.74 = 42.18 : x
  2. Step 2: Convert to fraction form
    69.20/103.74 = 42.18/x
  3. Step 3: Cross multiply
    69.20x = 103.74 × 42.18
  4. Step 4: Simplify right side
    69.20x = 4,375.75
  5. Step 5: Solve for x
    x = 4,375.75/69.20
  6. Step 6: Final answer
    x = 63.23

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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.