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Finding the Fourth Proportional to 1,271.31, 1,907.09 and 449.55

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Solution

The fourth proportional to 1,271.31, 1,907.09 and 449.55 is: 674.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,271.31 : 1,907.09 = 449.55 : x
  2. Step 2: Convert to fraction form
    1,271.31/1,907.09 = 449.55/x
  3. Step 3: Cross multiply
    1,271.31x = 1,907.09 × 449.55
  4. Step 4: Simplify right side
    1,271.31x = 857,332.31
  5. Step 5: Solve for x
    x = 857,332.31/1,271.31
  6. Step 6: Final answer
    x = 674.37

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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.