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Finding the Fourth Proportional to 7,917.94, 11,877.05 and 2,989.90

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Solution

The fourth proportional to 7,917.94, 11,877.05 and 2,989.90 is: 4,484.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,917.94 : 11,877.05 = 2,989.90 : x
  2. Step 2: Convert to fraction form
    7,917.94/11,877.05 = 2,989.90/x
  3. Step 3: Cross multiply
    7,917.94x = 11,877.05 × 2,989.90
  4. Step 4: Simplify right side
    7,917.94x = 35,511,191.80
  5. Step 5: Solve for x
    x = 35,511,191.80/7,917.94
  6. Step 6: Final answer
    x = 4,484.90

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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.