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Finding the Fourth Proportional to 13.71, 20.46 and 10.85

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Solution

The fourth proportional to 13.71, 20.46 and 10.85 is: 16.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.71 : 20.46 = 10.85 : x
  2. Step 2: Convert to fraction form
    13.71/20.46 = 10.85/x
  3. Step 3: Cross multiply
    13.71x = 20.46 × 10.85
  4. Step 4: Simplify right side
    13.71x = 221.89
  5. Step 5: Solve for x
    x = 221.89/13.71
  6. Step 6: Final answer
    x = 16.18

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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.