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Finding the Fourth Proportional to 11.15, 16.64 and 10.56

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Solution

The fourth proportional to 11.15, 16.64 and 10.56 is: 15.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.15 : 16.64 = 10.56 : x
  2. Step 2: Convert to fraction form
    11.15/16.64 = 10.56/x
  3. Step 3: Cross multiply
    11.15x = 16.64 × 10.56
  4. Step 4: Simplify right side
    11.15x = 175.72
  5. Step 5: Solve for x
    x = 175.72/11.15
  6. Step 6: Final answer
    x = 15.76

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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.