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Finding the Fourth Proportional to 8.25, 12.38 and 6.91

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Solution

The fourth proportional to 8.25, 12.38 and 6.91 is: 10.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.25 : 12.38 = 6.91 : x
  2. Step 2: Convert to fraction form
    8.25/12.38 = 6.91/x
  3. Step 3: Cross multiply
    8.25x = 12.38 × 6.91
  4. Step 4: Simplify right side
    8.25x = 85.55
  5. Step 5: Solve for x
    x = 85.55/8.25
  6. Step 6: Final answer
    x = 10.37

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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.