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Finding the Fourth Proportional to 18.61, 25.69 and 12.05

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Solution

The fourth proportional to 18.61, 25.69 and 12.05 is: 16.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.61 : 25.69 = 12.05 : x
  2. Step 2: Convert to fraction form
    18.61/25.69 = 12.05/x
  3. Step 3: Cross multiply
    18.61x = 25.69 × 12.05
  4. Step 4: Simplify right side
    18.61x = 309.56
  5. Step 5: Solve for x
    x = 309.56/18.61
  6. Step 6: Final answer
    x = 16.63

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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.