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Finding the Fourth Proportional to 9.38, 12.96 and 6.66

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Solution

The fourth proportional to 9.38, 12.96 and 6.66 is: 9.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.38 : 12.96 = 6.66 : x
  2. Step 2: Convert to fraction form
    9.38/12.96 = 6.66/x
  3. Step 3: Cross multiply
    9.38x = 12.96 × 6.66
  4. Step 4: Simplify right side
    9.38x = 86.31
  5. Step 5: Solve for x
    x = 86.31/9.38
  6. Step 6: Final answer
    x = 9.21

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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.