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Finding the Fourth Proportional to 7,921, 11,881.50 and 2,449

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Solution

The fourth proportional to 7,921, 11,881.50 and 2,449 is: 3,673.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,921 : 11,881.50 = 2,449 : x
  2. Step 2: Convert to fraction form
    7,921/11,881.50 = 2,449/x
  3. Step 3: Cross multiply
    7,921x = 11,881.50 × 2,449
  4. Step 4: Simplify right side
    7,921x = 29,097,793.50
  5. Step 5: Solve for x
    x = 29,097,793.50/7,921
  6. Step 6: Final answer
    x = 3,673.50

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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.