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Finding the Fourth Proportional to 20.66, 30.94 and 19.64

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Solution

The fourth proportional to 20.66, 30.94 and 19.64 is: 29.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.66 : 30.94 = 19.64 : x
  2. Step 2: Convert to fraction form
    20.66/30.94 = 19.64/x
  3. Step 3: Cross multiply
    20.66x = 30.94 × 19.64
  4. Step 4: Simplify right side
    20.66x = 607.69
  5. Step 5: Solve for x
    x = 607.69/20.66
  6. Step 6: Final answer
    x = 29.42

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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.