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Finding the Fourth Proportional to 863.18, 1,190.83 and 489.85

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Solution

The fourth proportional to 863.18, 1,190.83 and 489.85 is: 675.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.18 : 1,190.83 = 489.85 : x
  2. Step 2: Convert to fraction form
    863.18/1,190.83 = 489.85/x
  3. Step 3: Cross multiply
    863.18x = 1,190.83 × 489.85
  4. Step 4: Simplify right side
    863.18x = 583,334.05
  5. Step 5: Solve for x
    x = 583,334.05/863.18
  6. Step 6: Final answer
    x = 675.80

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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.