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Finding the Fourth Proportional to 421.22, 582.04 and 338.20

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Solution

The fourth proportional to 421.22, 582.04 and 338.20 is: 467.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.22 : 582.04 = 338.20 : x
  2. Step 2: Convert to fraction form
    421.22/582.04 = 338.20/x
  3. Step 3: Cross multiply
    421.22x = 582.04 × 338.20
  4. Step 4: Simplify right side
    421.22x = 196,845.93
  5. Step 5: Solve for x
    x = 196,845.93/421.22
  6. Step 6: Final answer
    x = 467.32

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.