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Finding the Fourth Proportional to 3,072.20, 4,607.40 and 881

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Solution

The fourth proportional to 3,072.20, 4,607.40 and 881 is: 1,321.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,072.20 : 4,607.40 = 881 : x
  2. Step 2: Convert to fraction form
    3,072.20/4,607.40 = 881/x
  3. Step 3: Cross multiply
    3,072.20x = 4,607.40 × 881
  4. Step 4: Simplify right side
    3,072.20x = 4,059,119.40
  5. Step 5: Solve for x
    x = 4,059,119.40/3,072.20
  6. Step 6: Final answer
    x = 1,321.24

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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.