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Finding the Fourth Proportional to 13.39, 19.96 and 12.68

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Solution

The fourth proportional to 13.39, 19.96 and 12.68 is: 18.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.39 : 19.96 = 12.68 : x
  2. Step 2: Convert to fraction form
    13.39/19.96 = 12.68/x
  3. Step 3: Cross multiply
    13.39x = 19.96 × 12.68
  4. Step 4: Simplify right side
    13.39x = 253.09
  5. Step 5: Solve for x
    x = 253.09/13.39
  6. Step 6: Final answer
    x = 18.90

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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.