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Finding the Fourth Proportional to 392.97, 589.46 and 369.21

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Solution

The fourth proportional to 392.97, 589.46 and 369.21 is: 553.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.97 : 589.46 = 369.21 : x
  2. Step 2: Convert to fraction form
    392.97/589.46 = 369.21/x
  3. Step 3: Cross multiply
    392.97x = 589.46 × 369.21
  4. Step 4: Simplify right side
    392.97x = 217,632.68
  5. Step 5: Solve for x
    x = 217,632.68/392.97
  6. Step 6: Final answer
    x = 553.82

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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.