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Finding the Fourth Proportional to 404.21, 557.55 and 330.41

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Solution

The fourth proportional to 404.21, 557.55 and 330.41 is: 455.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.21 : 557.55 = 330.41 : x
  2. Step 2: Convert to fraction form
    404.21/557.55 = 330.41/x
  3. Step 3: Cross multiply
    404.21x = 557.55 × 330.41
  4. Step 4: Simplify right side
    404.21x = 184,221.49
  5. Step 5: Solve for x
    x = 184,221.49/404.21
  6. Step 6: Final answer
    x = 455.75

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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.