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Finding the Fourth Proportional to 13.88, 20.94 and 13.80

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Solution

The fourth proportional to 13.88, 20.94 and 13.80 is: 20.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.88 : 20.94 = 13.80 : x
  2. Step 2: Convert to fraction form
    13.88/20.94 = 13.80/x
  3. Step 3: Cross multiply
    13.88x = 20.94 × 13.80
  4. Step 4: Simplify right side
    13.88x = 288.97
  5. Step 5: Solve for x
    x = 288.97/13.88
  6. Step 6: Final answer
    x = 20.83

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.