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Finding the Fourth Proportional to 54.22, 80.72 and 51.60

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Solution

The fourth proportional to 54.22, 80.72 and 51.60 is: 76.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    54.22 : 80.72 = 51.60 : x
  2. Step 2: Convert to fraction form
    54.22/80.72 = 51.60/x
  3. Step 3: Cross multiply
    54.22x = 80.72 × 51.60
  4. Step 4: Simplify right side
    54.22x = 4,164.89
  5. Step 5: Solve for x
    x = 4,164.89/54.22
  6. Step 6: Final answer
    x = 76.81

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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.