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Finding the Fourth Proportional to 20.24, 30.38 and 12.64

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Solution

The fourth proportional to 20.24, 30.38 and 12.64 is: 18.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.24 : 30.38 = 12.64 : x
  2. Step 2: Convert to fraction form
    20.24/30.38 = 12.64/x
  3. Step 3: Cross multiply
    20.24x = 30.38 × 12.64
  4. Step 4: Simplify right side
    20.24x = 384.00
  5. Step 5: Solve for x
    x = 384.00/20.24
  6. Step 6: Final answer
    x = 18.97

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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.