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Finding the Fourth Proportional to 678.62, 936.58 and 413.11

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Solution

The fourth proportional to 678.62, 936.58 and 413.11 is: 570.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.62 : 936.58 = 413.11 : x
  2. Step 2: Convert to fraction form
    678.62/936.58 = 413.11/x
  3. Step 3: Cross multiply
    678.62x = 936.58 × 413.11
  4. Step 4: Simplify right side
    678.62x = 386,910.56
  5. Step 5: Solve for x
    x = 386,910.56/678.62
  6. Step 6: Final answer
    x = 570.14

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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.