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Finding the Fourth Proportional to 8,665.28, 12,999 and 2,820.32

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Solution

The fourth proportional to 8,665.28, 12,999 and 2,820.32 is: 4,230.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,665.28 : 12,999 = 2,820.32 : x
  2. Step 2: Convert to fraction form
    8,665.28/12,999 = 2,820.32/x
  3. Step 3: Cross multiply
    8,665.28x = 12,999 × 2,820.32
  4. Step 4: Simplify right side
    8,665.28x = 36,661,339.68
  5. Step 5: Solve for x
    x = 36,661,339.68/8,665.28
  6. Step 6: Final answer
    x = 4,230.83

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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.