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Finding the Fourth Proportional to 20.94, 31.38 and 16.69

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Solution

The fourth proportional to 20.94, 31.38 and 16.69 is: 25.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.94 : 31.38 = 16.69 : x
  2. Step 2: Convert to fraction form
    20.94/31.38 = 16.69/x
  3. Step 3: Cross multiply
    20.94x = 31.38 × 16.69
  4. Step 4: Simplify right side
    20.94x = 523.73
  5. Step 5: Solve for x
    x = 523.73/20.94
  6. Step 6: Final answer
    x = 25.01

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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.