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Finding the Fourth Proportional to 69.90, 104.13 and 69.12

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Solution

The fourth proportional to 69.90, 104.13 and 69.12 is: 102.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.90 : 104.13 = 69.12 : x
  2. Step 2: Convert to fraction form
    69.90/104.13 = 69.12/x
  3. Step 3: Cross multiply
    69.90x = 104.13 × 69.12
  4. Step 4: Simplify right side
    69.90x = 7,197.47
  5. Step 5: Solve for x
    x = 7,197.47/69.90
  6. Step 6: Final answer
    x = 102.97

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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.