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Finding the Fourth Proportional to 13.87, 19.11 and 11.71

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Solution

The fourth proportional to 13.87, 19.11 and 11.71 is: 16.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.87 : 19.11 = 11.71 : x
  2. Step 2: Convert to fraction form
    13.87/19.11 = 11.71/x
  3. Step 3: Cross multiply
    13.87x = 19.11 × 11.71
  4. Step 4: Simplify right side
    13.87x = 223.78
  5. Step 5: Solve for x
    x = 223.78/13.87
  6. Step 6: Final answer
    x = 16.13

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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.