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Finding the Fourth Proportional to 3,384, 5,076 and 1,999.20

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Solution

The fourth proportional to 3,384, 5,076 and 1,999.20 is: 2,998.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,384 : 5,076 = 1,999.20 : x
  2. Step 2: Convert to fraction form
    3,384/5,076 = 1,999.20/x
  3. Step 3: Cross multiply
    3,384x = 5,076 × 1,999.20
  4. Step 4: Simplify right side
    3,384x = 10,147,939.20
  5. Step 5: Solve for x
    x = 10,147,939.20/3,384
  6. Step 6: Final answer
    x = 2,998.80

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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.