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Finding the Fourth Proportional to 13.86, 18.99 and 13.38

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Solution

The fourth proportional to 13.86, 18.99 and 13.38 is: 18.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.86 : 18.99 = 13.38 : x
  2. Step 2: Convert to fraction form
    13.86/18.99 = 13.38/x
  3. Step 3: Cross multiply
    13.86x = 18.99 × 13.38
  4. Step 4: Simplify right side
    13.86x = 254.09
  5. Step 5: Solve for x
    x = 254.09/13.86
  6. Step 6: Final answer
    x = 18.33

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.