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Finding the Fourth Proportional to 57.50, 86.67 and 54.19

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Solution

The fourth proportional to 57.50, 86.67 and 54.19 is: 81.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.50 : 86.67 = 54.19 : x
  2. Step 2: Convert to fraction form
    57.50/86.67 = 54.19/x
  3. Step 3: Cross multiply
    57.50x = 86.67 × 54.19
  4. Step 4: Simplify right side
    57.50x = 4,696.65
  5. Step 5: Solve for x
    x = 4,696.65/57.50
  6. Step 6: Final answer
    x = 81.68

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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.