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Finding the Fourth Proportional to 8,679.78, 13,021.29 and 2,836.71

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Solution

The fourth proportional to 8,679.78, 13,021.29 and 2,836.71 is: 4,255.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,679.78 : 13,021.29 = 2,836.71 : x
  2. Step 2: Convert to fraction form
    8,679.78/13,021.29 = 2,836.71/x
  3. Step 3: Cross multiply
    8,679.78x = 13,021.29 × 2,836.71
  4. Step 4: Simplify right side
    8,679.78x = 36,937,623.56
  5. Step 5: Solve for x
    x = 36,937,623.56/8,679.78
  6. Step 6: Final answer
    x = 4,255.59

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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.