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Finding the Fourth Proportional to 392.92, 589.38 and 231.70

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Solution

The fourth proportional to 392.92, 589.38 and 231.70 is: 347.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.92 : 589.38 = 231.70 : x
  2. Step 2: Convert to fraction form
    392.92/589.38 = 231.70/x
  3. Step 3: Cross multiply
    392.92x = 589.38 × 231.70
  4. Step 4: Simplify right side
    392.92x = 136,559.35
  5. Step 5: Solve for x
    x = 136,559.35/392.92
  6. Step 6: Final answer
    x = 347.55

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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.