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Finding the Fourth Proportional to 57.27, 85.97 and 47.15

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Solution

The fourth proportional to 57.27, 85.97 and 47.15 is: 70.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.27 : 85.97 = 47.15 : x
  2. Step 2: Convert to fraction form
    57.27/85.97 = 47.15/x
  3. Step 3: Cross multiply
    57.27x = 85.97 × 47.15
  4. Step 4: Simplify right side
    57.27x = 4,053.49
  5. Step 5: Solve for x
    x = 4,053.49/57.27
  6. Step 6: Final answer
    x = 70.78

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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.