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Finding the Fourth Proportional to 1,311.22, 1,966.92 and 489.49

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Solution

The fourth proportional to 1,311.22, 1,966.92 and 489.49 is: 734.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.22 : 1,966.92 = 489.49 : x
  2. Step 2: Convert to fraction form
    1,311.22/1,966.92 = 489.49/x
  3. Step 3: Cross multiply
    1,311.22x = 1,966.92 × 489.49
  4. Step 4: Simplify right side
    1,311.22x = 962,791.98
  5. Step 5: Solve for x
    x = 962,791.98/1,311.22
  6. Step 6: Final answer
    x = 734.27

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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.