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Finding the Fourth Proportional to 1,367.40, 2,049.87 and 489.75

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Solution

The fourth proportional to 1,367.40, 2,049.87 and 489.75 is: 734.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,367.40 : 2,049.87 = 489.75 : x
  2. Step 2: Convert to fraction form
    1,367.40/2,049.87 = 489.75/x
  3. Step 3: Cross multiply
    1,367.40x = 2,049.87 × 489.75
  4. Step 4: Simplify right side
    1,367.40x = 1,003,923.83
  5. Step 5: Solve for x
    x = 1,003,923.83/1,367.40
  6. Step 6: Final answer
    x = 734.18

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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.