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Finding the Fourth Proportional to 14, 21.13 and 13.90

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Solution

The fourth proportional to 14, 21.13 and 13.90 is: 20.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    14 : 21.13 = 13.90 : x
  2. Step 2: Convert to fraction form
    14/21.13 = 13.90/x
  3. Step 3: Cross multiply
    14x = 21.13 × 13.90
  4. Step 4: Simplify right side
    14x = 293.53
  5. Step 5: Solve for x
    x = 293.53/14
  6. Step 6: Final answer
    x = 20.97

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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.