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Finding the Fourth Proportional to 11.28, 15.54 and 8.55

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Solution

The fourth proportional to 11.28, 15.54 and 8.55 is: 11.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.28 : 15.54 = 8.55 : x
  2. Step 2: Convert to fraction form
    11.28/15.54 = 8.55/x
  3. Step 3: Cross multiply
    11.28x = 15.54 × 8.55
  4. Step 4: Simplify right side
    11.28x = 132.87
  5. Step 5: Solve for x
    x = 132.87/11.28
  6. Step 6: Final answer
    x = 11.78

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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.