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Finding the Fourth Proportional to 10.75, 16.12 and 3.98

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Solution

The fourth proportional to 10.75, 16.12 and 3.98 is: 5.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.75 : 16.12 = 3.98 : x
  2. Step 2: Convert to fraction form
    10.75/16.12 = 3.98/x
  3. Step 3: Cross multiply
    10.75x = 16.12 × 3.98
  4. Step 4: Simplify right side
    10.75x = 64.24
  5. Step 5: Solve for x
    x = 64.24/10.75
  6. Step 6: Final answer
    x = 5.97

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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.