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Finding the Fourth Proportional to 778.08, 1,167.15 and 413.58

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Solution

The fourth proportional to 778.08, 1,167.15 and 413.58 is: 620.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.08 : 1,167.15 = 413.58 : x
  2. Step 2: Convert to fraction form
    778.08/1,167.15 = 413.58/x
  3. Step 3: Cross multiply
    778.08x = 1,167.15 × 413.58
  4. Step 4: Simplify right side
    778.08x = 482,709.90
  5. Step 5: Solve for x
    x = 482,709.90/778.08
  6. Step 6: Final answer
    x = 620.39

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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.