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Finding the Fourth Proportional to 27.98, 38.60 and 18.65

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Solution

The fourth proportional to 27.98, 38.60 and 18.65 is: 25.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    27.98 : 38.60 = 18.65 : x
  2. Step 2: Convert to fraction form
    27.98/38.60 = 18.65/x
  3. Step 3: Cross multiply
    27.98x = 38.60 × 18.65
  4. Step 4: Simplify right side
    27.98x = 719.60
  5. Step 5: Solve for x
    x = 719.60/27.98
  6. Step 6: Final answer
    x = 25.72

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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.