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Finding the Fourth Proportional to 38.47, 57.72 and 18.18

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Solution

The fourth proportional to 38.47, 57.72 and 18.18 is: 27.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.47 : 57.72 = 18.18 : x
  2. Step 2: Convert to fraction form
    38.47/57.72 = 18.18/x
  3. Step 3: Cross multiply
    38.47x = 57.72 × 18.18
  4. Step 4: Simplify right side
    38.47x = 1,049.35
  5. Step 5: Solve for x
    x = 1,049.35/38.47
  6. Step 6: Final answer
    x = 27.28

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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.