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Finding the Fourth Proportional to 18.69, 25.79 and 11.31

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Solution

The fourth proportional to 18.69, 25.79 and 11.31 is: 15.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.69 : 25.79 = 11.31 : x
  2. Step 2: Convert to fraction form
    18.69/25.79 = 11.31/x
  3. Step 3: Cross multiply
    18.69x = 25.79 × 11.31
  4. Step 4: Simplify right side
    18.69x = 291.63
  5. Step 5: Solve for x
    x = 291.63/18.69
  6. Step 6: Final answer
    x = 15.61

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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.