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Finding the Fourth Proportional to 20.54, 30.74 and 12.80

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Solution

The fourth proportional to 20.54, 30.74 and 12.80 is: 19.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.54 : 30.74 = 12.80 : x
  2. Step 2: Convert to fraction form
    20.54/30.74 = 12.80/x
  3. Step 3: Cross multiply
    20.54x = 30.74 × 12.80
  4. Step 4: Simplify right side
    20.54x = 393.58
  5. Step 5: Solve for x
    x = 393.58/20.54
  6. Step 6: Final answer
    x = 19.17

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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.