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Finding the Fourth Proportional to 13.50, 20.16 and 11.88

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Solution

The fourth proportional to 13.50, 20.16 and 11.88 is: 17.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.50 : 20.16 = 11.88 : x
  2. Step 2: Convert to fraction form
    13.50/20.16 = 11.88/x
  3. Step 3: Cross multiply
    13.50x = 20.16 × 11.88
  4. Step 4: Simplify right side
    13.50x = 239.50
  5. Step 5: Solve for x
    x = 239.50/13.50
  6. Step 6: Final answer
    x = 17.74

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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.