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Finding the Fourth Proportional to 69.25, 103.78 and 34.57

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Solution

The fourth proportional to 69.25, 103.78 and 34.57 is: 51.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.25 : 103.78 = 34.57 : x
  2. Step 2: Convert to fraction form
    69.25/103.78 = 34.57/x
  3. Step 3: Cross multiply
    69.25x = 103.78 × 34.57
  4. Step 4: Simplify right side
    69.25x = 3,587.67
  5. Step 5: Solve for x
    x = 3,587.67/69.25
  6. Step 6: Final answer
    x = 51.81

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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.