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Finding the Fourth Proportional to 490.75, 677.27 and 283.75

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Solution

The fourth proportional to 490.75, 677.27 and 283.75 is: 391.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.75 : 677.27 = 283.75 : x
  2. Step 2: Convert to fraction form
    490.75/677.27 = 283.75/x
  3. Step 3: Cross multiply
    490.75x = 677.27 × 283.75
  4. Step 4: Simplify right side
    490.75x = 192,175.36
  5. Step 5: Solve for x
    x = 192,175.36/490.75
  6. Step 6: Final answer
    x = 391.60

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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.