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Finding the Fourth Proportional to 14.39, 21.45 and 13.68

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Solution

The fourth proportional to 14.39, 21.45 and 13.68 is: 20.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.39 : 21.45 = 13.68 : x
  2. Step 2: Convert to fraction form
    14.39/21.45 = 13.68/x
  3. Step 3: Cross multiply
    14.39x = 21.45 × 13.68
  4. Step 4: Simplify right side
    14.39x = 293.44
  5. Step 5: Solve for x
    x = 293.44/14.39
  6. Step 6: Final answer
    x = 20.39

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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.