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Finding the Fourth Proportional to 778.45, 1,166.46 and 489.28

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Solution

The fourth proportional to 778.45, 1,166.46 and 489.28 is: 733.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.45 : 1,166.46 = 489.28 : x
  2. Step 2: Convert to fraction form
    778.45/1,166.46 = 489.28/x
  3. Step 3: Cross multiply
    778.45x = 1,166.46 × 489.28
  4. Step 4: Simplify right side
    778.45x = 570,724.33
  5. Step 5: Solve for x
    x = 570,724.33/778.45
  6. Step 6: Final answer
    x = 733.15

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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.