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Finding the Fourth Proportional to 69.40, 103.73 and 55

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Solution

The fourth proportional to 69.40, 103.73 and 55 is: 82.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.40 : 103.73 = 55 : x
  2. Step 2: Convert to fraction form
    69.40/103.73 = 55/x
  3. Step 3: Cross multiply
    69.40x = 103.73 × 55
  4. Step 4: Simplify right side
    69.40x = 5,705.15
  5. Step 5: Solve for x
    x = 5,705.15/69.40
  6. Step 6: Final answer
    x = 82.21

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.