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Finding the Fourth Proportional to 11,280.88, 16,921.31 and 3,072.88

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Solution

The fourth proportional to 11,280.88, 16,921.31 and 3,072.88 is: 4,609.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,280.88 : 16,921.31 = 3,072.88 : x
  2. Step 2: Convert to fraction form
    11,280.88/16,921.31 = 3,072.88/x
  3. Step 3: Cross multiply
    11,280.88x = 16,921.31 × 3,072.88
  4. Step 4: Simplify right side
    11,280.88x = 51,997,078.15
  5. Step 5: Solve for x
    x = 51,997,078.15/11,280.88
  6. Step 6: Final answer
    x = 4,609.31

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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.