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Finding the Fourth Proportional to 8,672.89, 12,999.08 and 3,988.61

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Solution

The fourth proportional to 8,672.89, 12,999.08 and 3,988.61 is: 5,978.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,672.89 : 12,999.08 = 3,988.61 : x
  2. Step 2: Convert to fraction form
    8,672.89/12,999.08 = 3,988.61/x
  3. Step 3: Cross multiply
    8,672.89x = 12,999.08 × 3,988.61
  4. Step 4: Simplify right side
    8,672.89x = 51,848,205.45
  5. Step 5: Solve for x
    x = 51,848,205.45/8,672.89
  6. Step 6: Final answer
    x = 5,978.19

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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.