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Finding the Fourth Proportional to 392.44, 588.48 and 209.92

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Solution

The fourth proportional to 392.44, 588.48 and 209.92 is: 314.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.44 : 588.48 = 209.92 : x
  2. Step 2: Convert to fraction form
    392.44/588.48 = 209.92/x
  3. Step 3: Cross multiply
    392.44x = 588.48 × 209.92
  4. Step 4: Simplify right side
    392.44x = 123,533.72
  5. Step 5: Solve for x
    x = 123,533.72/392.44
  6. Step 6: Final answer
    x = 314.78

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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.