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Finding the Fourth Proportional to 392.22, 588.42 and 209.79

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Solution

The fourth proportional to 392.22, 588.42 and 209.79 is: 314.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.22 : 588.42 = 209.79 : x
  2. Step 2: Convert to fraction form
    392.22/588.42 = 209.79/x
  3. Step 3: Cross multiply
    392.22x = 588.42 × 209.79
  4. Step 4: Simplify right side
    392.22x = 123,444.63
  5. Step 5: Solve for x
    x = 123,444.63/392.22
  6. Step 6: Final answer
    x = 314.73

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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.