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Finding the Fourth Proportional to 395.78, 594.21 and 213.26

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Solution

The fourth proportional to 395.78, 594.21 and 213.26 is: 320.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.78 : 594.21 = 213.26 : x
  2. Step 2: Convert to fraction form
    395.78/594.21 = 213.26/x
  3. Step 3: Cross multiply
    395.78x = 594.21 × 213.26
  4. Step 4: Simplify right side
    395.78x = 126,721.22
  5. Step 5: Solve for x
    x = 126,721.22/395.78
  6. Step 6: Final answer
    x = 320.18

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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.