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Finding the Fourth Proportional to 69.81, 104.63 and 39.39

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Solution

The fourth proportional to 69.81, 104.63 and 39.39 is: 59.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.81 : 104.63 = 39.39 : x
  2. Step 2: Convert to fraction form
    69.81/104.63 = 39.39/x
  3. Step 3: Cross multiply
    69.81x = 104.63 × 39.39
  4. Step 4: Simplify right side
    69.81x = 4,121.18
  5. Step 5: Solve for x
    x = 4,121.18/69.81
  6. Step 6: Final answer
    x = 59.03

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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.