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Finding the Fourth Proportional to 1,272.11, 1,907.49 and 449.78

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Solution

The fourth proportional to 1,272.11, 1,907.49 and 449.78 is: 674.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.11 : 1,907.49 = 449.78 : x
  2. Step 2: Convert to fraction form
    1,272.11/1,907.49 = 449.78/x
  3. Step 3: Cross multiply
    1,272.11x = 1,907.49 × 449.78
  4. Step 4: Simplify right side
    1,272.11x = 857,950.85
  5. Step 5: Solve for x
    x = 857,950.85/1,272.11
  6. Step 6: Final answer
    x = 674.43

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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.