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Finding the Fourth Proportional to 47.42, 71.12 and 18.54

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Solution

The fourth proportional to 47.42, 71.12 and 18.54 is: 27.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.42 : 71.12 = 18.54 : x
  2. Step 2: Convert to fraction form
    47.42/71.12 = 18.54/x
  3. Step 3: Cross multiply
    47.42x = 71.12 × 18.54
  4. Step 4: Simplify right side
    47.42x = 1,318.56
  5. Step 5: Solve for x
    x = 1,318.56/47.42
  6. Step 6: Final answer
    x = 27.81

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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.