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Finding the Fourth Proportional to 395.80, 593.68 and 213.55

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Solution

The fourth proportional to 395.80, 593.68 and 213.55 is: 320.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.80 : 593.68 = 213.55 : x
  2. Step 2: Convert to fraction form
    395.80/593.68 = 213.55/x
  3. Step 3: Cross multiply
    395.80x = 593.68 × 213.55
  4. Step 4: Simplify right side
    395.80x = 126,780.36
  5. Step 5: Solve for x
    x = 126,780.36/395.80
  6. Step 6: Final answer
    x = 320.31

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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.