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Finding the Fourth Proportional to 404.21, 557.47 and 321.19

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Solution

The fourth proportional to 404.21, 557.47 and 321.19 is: 442.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.21 : 557.47 = 321.19 : x
  2. Step 2: Convert to fraction form
    404.21/557.47 = 321.19/x
  3. Step 3: Cross multiply
    404.21x = 557.47 × 321.19
  4. Step 4: Simplify right side
    404.21x = 179,053.79
  5. Step 5: Solve for x
    x = 179,053.79/404.21
  6. Step 6: Final answer
    x = 442.97

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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.