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Finding the Fourth Proportional to 404.49, 557.91 and 321.57

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Solution

The fourth proportional to 404.49, 557.91 and 321.57 is: 443.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.49 : 557.91 = 321.57 : x
  2. Step 2: Convert to fraction form
    404.49/557.91 = 321.57/x
  3. Step 3: Cross multiply
    404.49x = 557.91 × 321.57
  4. Step 4: Simplify right side
    404.49x = 179,407.12
  5. Step 5: Solve for x
    x = 179,407.12/404.49
  6. Step 6: Final answer
    x = 443.54

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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.