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Finding the Fourth Proportional to 13.28, 18.36 and 11.48

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Solution

The fourth proportional to 13.28, 18.36 and 11.48 is: 15.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.28 : 18.36 = 11.48 : x
  2. Step 2: Convert to fraction form
    13.28/18.36 = 11.48/x
  3. Step 3: Cross multiply
    13.28x = 18.36 × 11.48
  4. Step 4: Simplify right side
    13.28x = 210.77
  5. Step 5: Solve for x
    x = 210.77/13.28
  6. Step 6: Final answer
    x = 15.87

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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.