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Finding the Fourth Proportional to 8,638.85, 12,955.02 and 2,793.89

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Solution

The fourth proportional to 8,638.85, 12,955.02 and 2,793.89 is: 4,189.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,638.85 : 12,955.02 = 2,793.89 : x
  2. Step 2: Convert to fraction form
    8,638.85/12,955.02 = 2,793.89/x
  3. Step 3: Cross multiply
    8,638.85x = 12,955.02 × 2,793.89
  4. Step 4: Simplify right side
    8,638.85x = 36,194,900.83
  5. Step 5: Solve for x
    x = 36,194,900.83/8,638.85
  6. Step 6: Final answer
    x = 4,189.78

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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.