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Finding the Fourth Proportional to 14, 20.90 and 13.28

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Solution

The fourth proportional to 14, 20.90 and 13.28 is: 19.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    14 : 20.90 = 13.28 : x
  2. Step 2: Convert to fraction form
    14/20.90 = 13.28/x
  3. Step 3: Cross multiply
    14x = 20.90 × 13.28
  4. Step 4: Simplify right side
    14x = 277.55
  5. Step 5: Solve for x
    x = 277.55/14
  6. Step 6: Final answer
    x = 19.83

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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.