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Finding the Fourth Proportional to 49.20, 73.72 and 18.73

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Solution

The fourth proportional to 49.20, 73.72 and 18.73 is: 28.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.20 : 73.72 = 18.73 : x
  2. Step 2: Convert to fraction form
    49.20/73.72 = 18.73/x
  3. Step 3: Cross multiply
    49.20x = 73.72 × 18.73
  4. Step 4: Simplify right side
    49.20x = 1,380.78
  5. Step 5: Solve for x
    x = 1,380.78/49.20
  6. Step 6: Final answer
    x = 28.06

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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.