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Finding the Fourth Proportional to 392.87, 589.61 and 300.65

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Solution

The fourth proportional to 392.87, 589.61 and 300.65 is: 451.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.87 : 589.61 = 300.65 : x
  2. Step 2: Convert to fraction form
    392.87/589.61 = 300.65/x
  3. Step 3: Cross multiply
    392.87x = 589.61 × 300.65
  4. Step 4: Simplify right side
    392.87x = 177,264.05
  5. Step 5: Solve for x
    x = 177,264.05/392.87
  6. Step 6: Final answer
    x = 451.20

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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.