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Finding the Fourth Proportional to 18.28, 25.23 and 12.84

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Solution

The fourth proportional to 18.28, 25.23 and 12.84 is: 17.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.28 : 25.23 = 12.84 : x
  2. Step 2: Convert to fraction form
    18.28/25.23 = 12.84/x
  3. Step 3: Cross multiply
    18.28x = 25.23 × 12.84
  4. Step 4: Simplify right side
    18.28x = 323.83
  5. Step 5: Solve for x
    x = 323.83/18.28
  6. Step 6: Final answer
    x = 17.71

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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.