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Finding the Fourth Proportional to 10.91, 16.31 and 10.64

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Solution

The fourth proportional to 10.91, 16.31 and 10.64 is: 15.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.91 : 16.31 = 10.64 : x
  2. Step 2: Convert to fraction form
    10.91/16.31 = 10.64/x
  3. Step 3: Cross multiply
    10.91x = 16.31 × 10.64
  4. Step 4: Simplify right side
    10.91x = 173.61
  5. Step 5: Solve for x
    x = 173.61/10.91
  6. Step 6: Final answer
    x = 15.91

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.