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Finding the Fourth Proportional to 47.44, 71.20 and 18.94

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Solution

The fourth proportional to 47.44, 71.20 and 18.94 is: 28.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.44 : 71.20 = 18.94 : x
  2. Step 2: Convert to fraction form
    47.44/71.20 = 18.94/x
  3. Step 3: Cross multiply
    47.44x = 71.20 × 18.94
  4. Step 4: Simplify right side
    47.44x = 1,348.53
  5. Step 5: Solve for x
    x = 1,348.53/47.44
  6. Step 6: Final answer
    x = 28.43

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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.