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Finding the Fourth Proportional to 1,274.75, 1,912.11 and 659.66

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Solution

The fourth proportional to 1,274.75, 1,912.11 and 659.66 is: 989.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.75 : 1,912.11 = 659.66 : x
  2. Step 2: Convert to fraction form
    1,274.75/1,912.11 = 659.66/x
  3. Step 3: Cross multiply
    1,274.75x = 1,912.11 × 659.66
  4. Step 4: Simplify right side
    1,274.75x = 1,261,332.92
  5. Step 5: Solve for x
    x = 1,261,332.92/1,274.75
  6. Step 6: Final answer
    x = 989.48

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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.