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Finding the Fourth Proportional to 2,107, 2,907.78 and 1,279

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Solution

The fourth proportional to 2,107, 2,907.78 and 1,279 is: 1,765.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,107 : 2,907.78 = 1,279 : x
  2. Step 2: Convert to fraction form
    2,107/2,907.78 = 1,279/x
  3. Step 3: Cross multiply
    2,107x = 2,907.78 × 1,279
  4. Step 4: Simplify right side
    2,107x = 3,719,050.62
  5. Step 5: Solve for x
    x = 3,719,050.62/2,107
  6. Step 6: Final answer
    x = 1,765.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.