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Finding the Fourth Proportional to 392.85, 589.46 and 386.37

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Solution

The fourth proportional to 392.85, 589.46 and 386.37 is: 579.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.85 : 589.46 = 386.37 : x
  2. Step 2: Convert to fraction form
    392.85/589.46 = 386.37/x
  3. Step 3: Cross multiply
    392.85x = 589.46 × 386.37
  4. Step 4: Simplify right side
    392.85x = 227,747.73
  5. Step 5: Solve for x
    x = 227,747.73/392.85
  6. Step 6: Final answer
    x = 579.73

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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.