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Finding the Fourth Proportional to 11,980.89, 17,968.90 and 3,213.75

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Solution

The fourth proportional to 11,980.89, 17,968.90 and 3,213.75 is: 4,819.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,980.89 : 17,968.90 = 3,213.75 : x
  2. Step 2: Convert to fraction form
    11,980.89/17,968.90 = 3,213.75/x
  3. Step 3: Cross multiply
    11,980.89x = 17,968.90 × 3,213.75
  4. Step 4: Simplify right side
    11,980.89x = 57,747,552.38
  5. Step 5: Solve for x
    x = 57,747,552.38/11,980.89
  6. Step 6: Final answer
    x = 4,819.97

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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.