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Finding the Fourth Proportional to 678.45, 936.22 and 379.65

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Solution

The fourth proportional to 678.45, 936.22 and 379.65 is: 523.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.45 : 936.22 = 379.65 : x
  2. Step 2: Convert to fraction form
    678.45/936.22 = 379.65/x
  3. Step 3: Cross multiply
    678.45x = 936.22 × 379.65
  4. Step 4: Simplify right side
    678.45x = 355,433.93
  5. Step 5: Solve for x
    x = 355,433.93/678.45
  6. Step 6: Final answer
    x = 523.89

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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.