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Finding the Fourth Proportional to 7,921.96, 11,882 and 2,079

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Solution

The fourth proportional to 7,921.96, 11,882 and 2,079 is: 3,118.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,921.96 : 11,882 = 2,079 : x
  2. Step 2: Convert to fraction form
    7,921.96/11,882 = 2,079/x
  3. Step 3: Cross multiply
    7,921.96x = 11,882 × 2,079
  4. Step 4: Simplify right side
    7,921.96x = 24,702,678
  5. Step 5: Solve for x
    x = 24,702,678/7,921.96
  6. Step 6: Final answer
    x = 3,118.25

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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.