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Finding the Fourth Proportional to 14.02, 21.04 and 13.80

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Solution

The fourth proportional to 14.02, 21.04 and 13.80 is: 20.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.02 : 21.04 = 13.80 : x
  2. Step 2: Convert to fraction form
    14.02/21.04 = 13.80/x
  3. Step 3: Cross multiply
    14.02x = 21.04 × 13.80
  4. Step 4: Simplify right side
    14.02x = 290.35
  5. Step 5: Solve for x
    x = 290.35/14.02
  6. Step 6: Final answer
    x = 20.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.