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Finding the Fourth Proportional to 20.46, 30.72 and 12.83

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Solution

The fourth proportional to 20.46, 30.72 and 12.83 is: 19.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.46 : 30.72 = 12.83 : x
  2. Step 2: Convert to fraction form
    20.46/30.72 = 12.83/x
  3. Step 3: Cross multiply
    20.46x = 30.72 × 12.83
  4. Step 4: Simplify right side
    20.46x = 393.92
  5. Step 5: Solve for x
    x = 393.92/20.46
  6. Step 6: Final answer
    x = 19.25

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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.