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Finding the Fourth Proportional to 9.26, 12.81 and 9.21

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Solution

The fourth proportional to 9.26, 12.81 and 9.21 is: 12.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.26 : 12.81 = 9.21 : x
  2. Step 2: Convert to fraction form
    9.26/12.81 = 9.21/x
  3. Step 3: Cross multiply
    9.26x = 12.81 × 9.21
  4. Step 4: Simplify right side
    9.26x = 117.98
  5. Step 5: Solve for x
    x = 117.98/9.26
  6. Step 6: Final answer
    x = 12.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.