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Finding the Fourth Proportional to 69.39, 103.75 and 55.69

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Solution

The fourth proportional to 69.39, 103.75 and 55.69 is: 83.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.39 : 103.75 = 55.69 : x
  2. Step 2: Convert to fraction form
    69.39/103.75 = 55.69/x
  3. Step 3: Cross multiply
    69.39x = 103.75 × 55.69
  4. Step 4: Simplify right side
    69.39x = 5,777.44
  5. Step 5: Solve for x
    x = 5,777.44/69.39
  6. Step 6: Final answer
    x = 83.26

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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.