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Finding the Fourth Proportional to 8.91, 13.39 and 6.92

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Solution

The fourth proportional to 8.91, 13.39 and 6.92 is: 10.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.91 : 13.39 = 6.92 : x
  2. Step 2: Convert to fraction form
    8.91/13.39 = 6.92/x
  3. Step 3: Cross multiply
    8.91x = 13.39 × 6.92
  4. Step 4: Simplify right side
    8.91x = 92.67
  5. Step 5: Solve for x
    x = 92.67/8.91
  6. Step 6: Final answer
    x = 10.40

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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.