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Finding the Fourth Proportional to 862.85, 1,190.73 and 489.83

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Solution

The fourth proportional to 862.85, 1,190.73 and 489.83 is: 675.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.85 : 1,190.73 = 489.83 : x
  2. Step 2: Convert to fraction form
    862.85/1,190.73 = 489.83/x
  3. Step 3: Cross multiply
    862.85x = 1,190.73 × 489.83
  4. Step 4: Simplify right side
    862.85x = 583,249.32
  5. Step 5: Solve for x
    x = 583,249.32/862.85
  6. Step 6: Final answer
    x = 675.96

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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.