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Finding the Fourth Proportional to 13.38, 18.45 and 11.78

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Solution

The fourth proportional to 13.38, 18.45 and 11.78 is: 16.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.38 : 18.45 = 11.78 : x
  2. Step 2: Convert to fraction form
    13.38/18.45 = 11.78/x
  3. Step 3: Cross multiply
    13.38x = 18.45 × 11.78
  4. Step 4: Simplify right side
    13.38x = 217.34
  5. Step 5: Solve for x
    x = 217.34/13.38
  6. Step 6: Final answer
    x = 16.24

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.