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Finding the Fourth Proportional to 57.02, 85.48 and 28.54

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Solution

The fourth proportional to 57.02, 85.48 and 28.54 is: 42.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.02 : 85.48 = 28.54 : x
  2. Step 2: Convert to fraction form
    57.02/85.48 = 28.54/x
  3. Step 3: Cross multiply
    57.02x = 85.48 × 28.54
  4. Step 4: Simplify right side
    57.02x = 2,439.60
  5. Step 5: Solve for x
    x = 2,439.60/57.02
  6. Step 6: Final answer
    x = 42.78

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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.