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Finding the Fourth Proportional to 10.82, 16.19 and 7.80

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Solution

The fourth proportional to 10.82, 16.19 and 7.80 is: 11.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.82 : 16.19 = 7.80 : x
  2. Step 2: Convert to fraction form
    10.82/16.19 = 7.80/x
  3. Step 3: Cross multiply
    10.82x = 16.19 × 7.80
  4. Step 4: Simplify right side
    10.82x = 126.28
  5. Step 5: Solve for x
    x = 126.28/10.82
  6. Step 6: Final answer
    x = 11.67

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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.