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Finding the Fourth Proportional to 57.20, 86.12 and 53.60

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Solution

The fourth proportional to 57.20, 86.12 and 53.60 is: 80.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.20 : 86.12 = 53.60 : x
  2. Step 2: Convert to fraction form
    57.20/86.12 = 53.60/x
  3. Step 3: Cross multiply
    57.20x = 86.12 × 53.60
  4. Step 4: Simplify right side
    57.20x = 4,616.03
  5. Step 5: Solve for x
    x = 4,616.03/57.20
  6. Step 6: Final answer
    x = 80.70

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.