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Finding the Fourth Proportional to 2,115.52, 3,172.40 and 799.05

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Solution

The fourth proportional to 2,115.52, 3,172.40 and 799.05 is: 1,198.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.52 : 3,172.40 = 799.05 : x
  2. Step 2: Convert to fraction form
    2,115.52/3,172.40 = 799.05/x
  3. Step 3: Cross multiply
    2,115.52x = 3,172.40 × 799.05
  4. Step 4: Simplify right side
    2,115.52x = 2,534,891.36
  5. Step 5: Solve for x
    x = 2,534,891.36/2,115.52
  6. Step 6: Final answer
    x = 1,198.24

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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.