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Finding the Fourth Proportional to 18.63, 27.89 and 12.59

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Solution

The fourth proportional to 18.63, 27.89 and 12.59 is: 18.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.63 : 27.89 = 12.59 : x
  2. Step 2: Convert to fraction form
    18.63/27.89 = 12.59/x
  3. Step 3: Cross multiply
    18.63x = 27.89 × 12.59
  4. Step 4: Simplify right side
    18.63x = 350.93
  5. Step 5: Solve for x
    x = 350.93/18.63
  6. Step 6: Final answer
    x = 18.84

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.