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Finding the Fourth Proportional to 11.05, 16.45 and 10.68

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Solution

The fourth proportional to 11.05, 16.45 and 10.68 is: 15.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.05 : 16.45 = 10.68 : x
  2. Step 2: Convert to fraction form
    11.05/16.45 = 10.68/x
  3. Step 3: Cross multiply
    11.05x = 16.45 × 10.68
  4. Step 4: Simplify right side
    11.05x = 175.75
  5. Step 5: Solve for x
    x = 175.75/11.05
  6. Step 6: Final answer
    x = 15.90

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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.