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Finding the Fourth Proportional to 490.67, 677.04 and 280.82

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Solution

The fourth proportional to 490.67, 677.04 and 280.82 is: 387.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.67 : 677.04 = 280.82 : x
  2. Step 2: Convert to fraction form
    490.67/677.04 = 280.82/x
  3. Step 3: Cross multiply
    490.67x = 677.04 × 280.82
  4. Step 4: Simplify right side
    490.67x = 190,122.99
  5. Step 5: Solve for x
    x = 190,122.99/490.67
  6. Step 6: Final answer
    x = 387.48

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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.