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Finding the Fourth Proportional to 455.90, 629.34 and 281.48

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Solution

The fourth proportional to 455.90, 629.34 and 281.48 is: 388.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.90 : 629.34 = 281.48 : x
  2. Step 2: Convert to fraction form
    455.90/629.34 = 281.48/x
  3. Step 3: Cross multiply
    455.90x = 629.34 × 281.48
  4. Step 4: Simplify right side
    455.90x = 177,146.62
  5. Step 5: Solve for x
    x = 177,146.62/455.90
  6. Step 6: Final answer
    x = 388.56

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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.