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Finding the Fourth Proportional to 404.21, 557.73 and 238.43

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Solution

The fourth proportional to 404.21, 557.73 and 238.43 is: 328.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.21 : 557.73 = 238.43 : x
  2. Step 2: Convert to fraction form
    404.21/557.73 = 238.43/x
  3. Step 3: Cross multiply
    404.21x = 557.73 × 238.43
  4. Step 4: Simplify right side
    404.21x = 132,979.56
  5. Step 5: Solve for x
    x = 132,979.56/404.21
  6. Step 6: Final answer
    x = 328.99

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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.