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Finding the Fourth Proportional to 392.75, 589.23 and 149.15

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Solution

The fourth proportional to 392.75, 589.23 and 149.15 is: 223.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.75 : 589.23 = 149.15 : x
  2. Step 2: Convert to fraction form
    392.75/589.23 = 149.15/x
  3. Step 3: Cross multiply
    392.75x = 589.23 × 149.15
  4. Step 4: Simplify right side
    392.75x = 87,880.34
  5. Step 5: Solve for x
    x = 87,880.34/392.75
  6. Step 6: Final answer
    x = 223.75

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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.