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Finding the Fourth Proportional to 10.91, 16.38 and 6.64

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Solution

The fourth proportional to 10.91, 16.38 and 6.64 is: 9.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.91 : 16.38 = 6.64 : x
  2. Step 2: Convert to fraction form
    10.91/16.38 = 6.64/x
  3. Step 3: Cross multiply
    10.91x = 16.38 × 6.64
  4. Step 4: Simplify right side
    10.91x = 108.72
  5. Step 5: Solve for x
    x = 108.72/10.91
  6. Step 6: Final answer
    x = 9.96

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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.