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Finding the Fourth Proportional to 13.88, 19.11 and 12.91

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Solution

The fourth proportional to 13.88, 19.11 and 12.91 is: 17.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.88 : 19.11 = 12.91 : x
  2. Step 2: Convert to fraction form
    13.88/19.11 = 12.91/x
  3. Step 3: Cross multiply
    13.88x = 19.11 × 12.91
  4. Step 4: Simplify right side
    13.88x = 246.71
  5. Step 5: Solve for x
    x = 246.71/13.88
  6. Step 6: Final answer
    x = 17.77

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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.