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Finding the Fourth Proportional to 862.95, 1,190.81 and 489.94

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Solution

The fourth proportional to 862.95, 1,190.81 and 489.94 is: 676.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.95 : 1,190.81 = 489.94 : x
  2. Step 2: Convert to fraction form
    862.95/1,190.81 = 489.94/x
  3. Step 3: Cross multiply
    862.95x = 1,190.81 × 489.94
  4. Step 4: Simplify right side
    862.95x = 583,419.50
  5. Step 5: Solve for x
    x = 583,419.50/862.95
  6. Step 6: Final answer
    x = 676.08

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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.