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Finding the Fourth Proportional to 779.18, 1,169.22 and 413.98

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Solution

The fourth proportional to 779.18, 1,169.22 and 413.98 is: 621.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.18 : 1,169.22 = 413.98 : x
  2. Step 2: Convert to fraction form
    779.18/1,169.22 = 413.98/x
  3. Step 3: Cross multiply
    779.18x = 1,169.22 × 413.98
  4. Step 4: Simplify right side
    779.18x = 484,033.70
  5. Step 5: Solve for x
    x = 484,033.70/779.18
  6. Step 6: Final answer
    x = 621.21

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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.