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Finding the Fourth Proportional to 678.92, 936.95 and 413.54

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Solution

The fourth proportional to 678.92, 936.95 and 413.54 is: 570.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.92 : 936.95 = 413.54 : x
  2. Step 2: Convert to fraction form
    678.92/936.95 = 413.54/x
  3. Step 3: Cross multiply
    678.92x = 936.95 × 413.54
  4. Step 4: Simplify right side
    678.92x = 387,466.30
  5. Step 5: Solve for x
    x = 387,466.30/678.92
  6. Step 6: Final answer
    x = 570.71

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.