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Finding the Fourth Proportional to 855.37, 1,281.87 and 489.39

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Solution

The fourth proportional to 855.37, 1,281.87 and 489.39 is: 733.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.37 : 1,281.87 = 489.39 : x
  2. Step 2: Convert to fraction form
    855.37/1,281.87 = 489.39/x
  3. Step 3: Cross multiply
    855.37x = 1,281.87 × 489.39
  4. Step 4: Simplify right side
    855.37x = 627,334.36
  5. Step 5: Solve for x
    x = 627,334.36/855.37
  6. Step 6: Final answer
    x = 733.41

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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.