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Finding the Fourth Proportional to 3,984.84, 5,978.18 and 1,211.33

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Solution

The fourth proportional to 3,984.84, 5,978.18 and 1,211.33 is: 1,817.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,984.84 : 5,978.18 = 1,211.33 : x
  2. Step 2: Convert to fraction form
    3,984.84/5,978.18 = 1,211.33/x
  3. Step 3: Cross multiply
    3,984.84x = 5,978.18 × 1,211.33
  4. Step 4: Simplify right side
    3,984.84x = 7,241,566.75
  5. Step 5: Solve for x
    x = 7,241,566.75/3,984.84
  6. Step 6: Final answer
    x = 1,817.28

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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.