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Finding the Fourth Proportional to 11.21, 16.82 and 4.45

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Solution

The fourth proportional to 11.21, 16.82 and 4.45 is: 6.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.21 : 16.82 = 4.45 : x
  2. Step 2: Convert to fraction form
    11.21/16.82 = 4.45/x
  3. Step 3: Cross multiply
    11.21x = 16.82 × 4.45
  4. Step 4: Simplify right side
    11.21x = 74.80
  5. Step 5: Solve for x
    x = 74.80/11.21
  6. Step 6: Final answer
    x = 6.67

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.