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Finding the Fourth Proportional to 20.75, 28.63 and 12.12

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Solution

The fourth proportional to 20.75, 28.63 and 12.12 is: 16.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.75 : 28.63 = 12.12 : x
  2. Step 2: Convert to fraction form
    20.75/28.63 = 12.12/x
  3. Step 3: Cross multiply
    20.75x = 28.63 × 12.12
  4. Step 4: Simplify right side
    20.75x = 346.94
  5. Step 5: Solve for x
    x = 346.94/20.75
  6. Step 6: Final answer
    x = 16.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.