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Finding the Fourth Proportional to 7,881.18, 11,805.30 and 3,724.80

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Solution

The fourth proportional to 7,881.18, 11,805.30 and 3,724.80 is: 5,579.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,881.18 : 11,805.30 = 3,724.80 : x
  2. Step 2: Convert to fraction form
    7,881.18/11,805.30 = 3,724.80/x
  3. Step 3: Cross multiply
    7,881.18x = 11,805.30 × 3,724.80
  4. Step 4: Simplify right side
    7,881.18x = 43,972,381.44
  5. Step 5: Solve for x
    x = 43,972,381.44/7,881.18
  6. Step 6: Final answer
    x = 5,579.42

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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.