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Finding the Fourth Proportional to 13.36, 20.11 and 12.40

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Solution

The fourth proportional to 13.36, 20.11 and 12.40 is: 18.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.36 : 20.11 = 12.40 : x
  2. Step 2: Convert to fraction form
    13.36/20.11 = 12.40/x
  3. Step 3: Cross multiply
    13.36x = 20.11 × 12.40
  4. Step 4: Simplify right side
    13.36x = 249.26
  5. Step 5: Solve for x
    x = 249.26/13.36
  6. Step 6: Final answer
    x = 18.66

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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.