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Finding the Fourth Proportional to 393.21, 590.34 and 254.58

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Solution

The fourth proportional to 393.21, 590.34 and 254.58 is: 382.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.21 : 590.34 = 254.58 : x
  2. Step 2: Convert to fraction form
    393.21/590.34 = 254.58/x
  3. Step 3: Cross multiply
    393.21x = 590.34 × 254.58
  4. Step 4: Simplify right side
    393.21x = 150,288.76
  5. Step 5: Solve for x
    x = 150,288.76/393.21
  6. Step 6: Final answer
    x = 382.21

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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.