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Finding the Fourth Proportional to 11.28, 16.86 and 11.28

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Solution

The fourth proportional to 11.28, 16.86 and 11.28 is: 16.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.28 : 16.86 = 11.28 : x
  2. Step 2: Convert to fraction form
    11.28/16.86 = 11.28/x
  3. Step 3: Cross multiply
    11.28x = 16.86 × 11.28
  4. Step 4: Simplify right side
    11.28x = 190.18
  5. Step 5: Solve for x
    x = 190.18/11.28
  6. Step 6: Final answer
    x = 16.86

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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.