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Finding the Fourth Proportional to 27.98, 38.63 and 18.79

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Solution

The fourth proportional to 27.98, 38.63 and 18.79 is: 25.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    27.98 : 38.63 = 18.79 : x
  2. Step 2: Convert to fraction form
    27.98/38.63 = 18.79/x
  3. Step 3: Cross multiply
    27.98x = 38.63 × 18.79
  4. Step 4: Simplify right side
    27.98x = 725.97
  5. Step 5: Solve for x
    x = 725.97/27.98
  6. Step 6: Final answer
    x = 25.94

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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.