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Finding the Fourth Proportional to 57.28, 85.50 and 54.80

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Solution

The fourth proportional to 57.28, 85.50 and 54.80 is: 81.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.28 : 85.50 = 54.80 : x
  2. Step 2: Convert to fraction form
    57.28/85.50 = 54.80/x
  3. Step 3: Cross multiply
    57.28x = 85.50 × 54.80
  4. Step 4: Simplify right side
    57.28x = 4,685.40
  5. Step 5: Solve for x
    x = 4,685.40/57.28
  6. Step 6: Final answer
    x = 81.80

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.