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Finding the Fourth Proportional to 69.39, 104.19 and 42.45

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Solution

The fourth proportional to 69.39, 104.19 and 42.45 is: 63.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.39 : 104.19 = 42.45 : x
  2. Step 2: Convert to fraction form
    69.39/104.19 = 42.45/x
  3. Step 3: Cross multiply
    69.39x = 104.19 × 42.45
  4. Step 4: Simplify right side
    69.39x = 4,422.87
  5. Step 5: Solve for x
    x = 4,422.87/69.39
  6. Step 6: Final answer
    x = 63.74

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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.