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Finding the Fourth Proportional to 69.40, 104.20 and 42.46

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Solution

The fourth proportional to 69.40, 104.20 and 42.46 is: 63.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.40 : 104.20 = 42.46 : x
  2. Step 2: Convert to fraction form
    69.40/104.20 = 42.46/x
  3. Step 3: Cross multiply
    69.40x = 104.20 × 42.46
  4. Step 4: Simplify right side
    69.40x = 4,424.33
  5. Step 5: Solve for x
    x = 4,424.33/69.40
  6. Step 6: Final answer
    x = 63.75

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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.