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Finding the Fourth Proportional to 1,272.46, 1,912.11 and 687.89

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Solution

The fourth proportional to 1,272.46, 1,912.11 and 687.89 is: 1,033.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.46 : 1,912.11 = 687.89 : x
  2. Step 2: Convert to fraction form
    1,272.46/1,912.11 = 687.89/x
  3. Step 3: Cross multiply
    1,272.46x = 1,912.11 × 687.89
  4. Step 4: Simplify right side
    1,272.46x = 1,315,323.55
  5. Step 5: Solve for x
    x = 1,315,323.55/1,272.46
  6. Step 6: Final answer
    x = 1,033.69

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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.