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Finding the Fourth Proportional to 490.97, 681.22 and 486.79

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Solution

The fourth proportional to 490.97, 681.22 and 486.79 is: 675.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.97 : 681.22 = 486.79 : x
  2. Step 2: Convert to fraction form
    490.97/681.22 = 486.79/x
  3. Step 3: Cross multiply
    490.97x = 681.22 × 486.79
  4. Step 4: Simplify right side
    490.97x = 331,611.08
  5. Step 5: Solve for x
    x = 331,611.08/490.97
  6. Step 6: Final answer
    x = 675.42

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.