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Finding the Fourth Proportional to 855.18, 1,280.52 and 489.60

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Solution

The fourth proportional to 855.18, 1,280.52 and 489.60 is: 733.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.18 : 1,280.52 = 489.60 : x
  2. Step 2: Convert to fraction form
    855.18/1,280.52 = 489.60/x
  3. Step 3: Cross multiply
    855.18x = 1,280.52 × 489.60
  4. Step 4: Simplify right side
    855.18x = 626,942.59
  5. Step 5: Solve for x
    x = 626,942.59/855.18
  6. Step 6: Final answer
    x = 733.11

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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.