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Finding the Fourth Proportional to 455.41, 629.13 and 447.21

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Solution

The fourth proportional to 455.41, 629.13 and 447.21 is: 617.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.41 : 629.13 = 447.21 : x
  2. Step 2: Convert to fraction form
    455.41/629.13 = 447.21/x
  3. Step 3: Cross multiply
    455.41x = 629.13 × 447.21
  4. Step 4: Simplify right side
    455.41x = 281,353.23
  5. Step 5: Solve for x
    x = 281,353.23/455.41
  6. Step 6: Final answer
    x = 617.80

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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.