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Finding the Fourth Proportional to 2,796.89, 3,859.65 and 1,912.66

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Solution

The fourth proportional to 2,796.89, 3,859.65 and 1,912.66 is: 2,639.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,796.89 : 3,859.65 = 1,912.66 : x
  2. Step 2: Convert to fraction form
    2,796.89/3,859.65 = 1,912.66/x
  3. Step 3: Cross multiply
    2,796.89x = 3,859.65 × 1,912.66
  4. Step 4: Simplify right side
    2,796.89x = 7,382,188.52
  5. Step 5: Solve for x
    x = 7,382,188.52/2,796.89
  6. Step 6: Final answer
    x = 2,639.43

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1.5x scale

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.