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Finding the Fourth Proportional to 11.28, 15.56 and 10.64

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Solution

The fourth proportional to 11.28, 15.56 and 10.64 is: 14.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.28 : 15.56 = 10.64 : x
  2. Step 2: Convert to fraction form
    11.28/15.56 = 10.64/x
  3. Step 3: Cross multiply
    11.28x = 15.56 × 10.64
  4. Step 4: Simplify right side
    11.28x = 165.56
  5. Step 5: Solve for x
    x = 165.56/11.28
  6. Step 6: Final answer
    x = 14.68

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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.