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Finding the Fourth Proportional to 862.93, 1,190.85 and 489.90

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Solution

The fourth proportional to 862.93, 1,190.85 and 489.90 is: 676.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.93 : 1,190.85 = 489.90 : x
  2. Step 2: Convert to fraction form
    862.93/1,190.85 = 489.90/x
  3. Step 3: Cross multiply
    862.93x = 1,190.85 × 489.90
  4. Step 4: Simplify right side
    862.93x = 583,391.89
  5. Step 5: Solve for x
    x = 583,391.89/862.93
  6. Step 6: Final answer
    x = 676.06

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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.