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Finding the Fourth Proportional to 20.74, 28.59 and 12.97

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Solution

The fourth proportional to 20.74, 28.59 and 12.97 is: 17.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20.74 : 28.59 = 12.97 : x
  2. Step 2: Convert to fraction form
    20.74/28.59 = 12.97/x
  3. Step 3: Cross multiply
    20.74x = 28.59 × 12.97
  4. Step 4: Simplify right side
    20.74x = 370.74
  5. Step 5: Solve for x
    x = 370.74/20.74
  6. Step 6: Final answer
    x = 17.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.