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Finding the Fourth Proportional to 8,631.83, 12,945 and 2,787.08

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Solution

The fourth proportional to 8,631.83, 12,945 and 2,787.08 is: 4,179.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,631.83 : 12,945 = 2,787.08 : x
  2. Step 2: Convert to fraction form
    8,631.83/12,945 = 2,787.08/x
  3. Step 3: Cross multiply
    8,631.83x = 12,945 × 2,787.08
  4. Step 4: Simplify right side
    8,631.83x = 36,078,750.60
  5. Step 5: Solve for x
    x = 36,078,750.60/8,631.83
  6. Step 6: Final answer
    x = 4,179.73

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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.