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Finding the Fourth Proportional to 69.39, 103.71 and 52.11

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Solution

The fourth proportional to 69.39, 103.71 and 52.11 is: 77.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.39 : 103.71 = 52.11 : x
  2. Step 2: Convert to fraction form
    69.39/103.71 = 52.11/x
  3. Step 3: Cross multiply
    69.39x = 103.71 × 52.11
  4. Step 4: Simplify right side
    69.39x = 5,404.52
  5. Step 5: Solve for x
    x = 5,404.52/69.39
  6. Step 6: Final answer
    x = 77.89

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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.