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Finding the Fourth Proportional to 456.26, 629.71 and 281.70

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Solution

The fourth proportional to 456.26, 629.71 and 281.70 is: 388.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.26 : 629.71 = 281.70 : x
  2. Step 2: Convert to fraction form
    456.26/629.71 = 281.70/x
  3. Step 3: Cross multiply
    456.26x = 629.71 × 281.70
  4. Step 4: Simplify right side
    456.26x = 177,388.60
  5. Step 5: Solve for x
    x = 177,388.60/456.26
  6. Step 6: Final answer
    x = 388.79

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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.