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Finding the Fourth Proportional to 404.28, 557.71 and 321.21

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Solution

The fourth proportional to 404.28, 557.71 and 321.21 is: 443.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.28 : 557.71 = 321.21 : x
  2. Step 2: Convert to fraction form
    404.28/557.71 = 321.21/x
  3. Step 3: Cross multiply
    404.28x = 557.71 × 321.21
  4. Step 4: Simplify right side
    404.28x = 179,139.13
  5. Step 5: Solve for x
    x = 179,139.13/404.28
  6. Step 6: Final answer
    x = 443.10

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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.