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Finding the Fourth Proportional to 18.26, 25.17 and 12.80

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Solution

The fourth proportional to 18.26, 25.17 and 12.80 is: 17.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.26 : 25.17 = 12.80 : x
  2. Step 2: Convert to fraction form
    18.26/25.17 = 12.80/x
  3. Step 3: Cross multiply
    18.26x = 25.17 × 12.80
  4. Step 4: Simplify right side
    18.26x = 322.05
  5. Step 5: Solve for x
    x = 322.05/18.26
  6. Step 6: Final answer
    x = 17.64

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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.