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Finding the Fourth Proportional to 2,181, 3,270.84 and 720.54

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Solution

The fourth proportional to 2,181, 3,270.84 and 720.54 is: 1,080.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,181 : 3,270.84 = 720.54 : x
  2. Step 2: Convert to fraction form
    2,181/3,270.84 = 720.54/x
  3. Step 3: Cross multiply
    2,181x = 3,270.84 × 720.54
  4. Step 4: Simplify right side
    2,181x = 2,356,771.05
  5. Step 5: Solve for x
    x = 2,356,771.05/2,181
  6. Step 6: Final answer
    x = 1,080.59

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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.