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Finding the Fourth Proportional to 3,186.99, 4,780.44 and 1,239.21

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Solution

The fourth proportional to 3,186.99, 4,780.44 and 1,239.21 is: 1,858.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,186.99 : 4,780.44 = 1,239.21 : x
  2. Step 2: Convert to fraction form
    3,186.99/4,780.44 = 1,239.21/x
  3. Step 3: Cross multiply
    3,186.99x = 4,780.44 × 1,239.21
  4. Step 4: Simplify right side
    3,186.99x = 5,923,969.05
  5. Step 5: Solve for x
    x = 5,923,969.05/3,186.99
  6. Step 6: Final answer
    x = 1,858.80

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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.