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Finding the Fourth Proportional to 7,842.76, 11,759.46 and 2,647.96

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Solution

The fourth proportional to 7,842.76, 11,759.46 and 2,647.96 is: 3,970.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,842.76 : 11,759.46 = 2,647.96 : x
  2. Step 2: Convert to fraction form
    7,842.76/11,759.46 = 2,647.96/x
  3. Step 3: Cross multiply
    7,842.76x = 11,759.46 × 2,647.96
  4. Step 4: Simplify right side
    7,842.76x = 31,138,579.70
  5. Step 5: Solve for x
    x = 31,138,579.70/7,842.76
  6. Step 6: Final answer
    x = 3,970.36

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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.