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Finding the Fourth Proportional to 71.92, 108.16 and 54

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Solution

The fourth proportional to 71.92, 108.16 and 54 is: 81.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.92 : 108.16 = 54 : x
  2. Step 2: Convert to fraction form
    71.92/108.16 = 54/x
  3. Step 3: Cross multiply
    71.92x = 108.16 × 54
  4. Step 4: Simplify right side
    71.92x = 5,840.64
  5. Step 5: Solve for x
    x = 5,840.64/71.92
  6. Step 6: Final answer
    x = 81.21

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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.