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Finding the Fourth Proportional to 3,986.19, 5,980.20 and 1,212.87

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Solution

The fourth proportional to 3,986.19, 5,980.20 and 1,212.87 is: 1,819.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,986.19 : 5,980.20 = 1,212.87 : x
  2. Step 2: Convert to fraction form
    3,986.19/5,980.20 = 1,212.87/x
  3. Step 3: Cross multiply
    3,986.19x = 5,980.20 × 1,212.87
  4. Step 4: Simplify right side
    3,986.19x = 7,253,205.17
  5. Step 5: Solve for x
    x = 7,253,205.17/3,986.19
  6. Step 6: Final answer
    x = 1,819.58

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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.