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Finding the Fourth Proportional to 57.26, 86.20 and 53.75

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Solution

The fourth proportional to 57.26, 86.20 and 53.75 is: 80.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.26 : 86.20 = 53.75 : x
  2. Step 2: Convert to fraction form
    57.26/86.20 = 53.75/x
  3. Step 3: Cross multiply
    57.26x = 86.20 × 53.75
  4. Step 4: Simplify right side
    57.26x = 4,632.98
  5. Step 5: Solve for x
    x = 4,632.98/57.26
  6. Step 6: Final answer
    x = 80.91

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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.