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Finding the Fourth Proportional to 57.42, 85.99 and 47.73

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Solution

The fourth proportional to 57.42, 85.99 and 47.73 is: 71.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.42 : 85.99 = 47.73 : x
  2. Step 2: Convert to fraction form
    57.42/85.99 = 47.73/x
  3. Step 3: Cross multiply
    57.42x = 85.99 × 47.73
  4. Step 4: Simplify right side
    57.42x = 4,104.30
  5. Step 5: Solve for x
    x = 4,104.30/57.42
  6. Step 6: Final answer
    x = 71.48

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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.