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Finding the Fourth Proportional to 490.57, 677.49 and 351.45

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Solution

The fourth proportional to 490.57, 677.49 and 351.45 is: 485.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.57 : 677.49 = 351.45 : x
  2. Step 2: Convert to fraction form
    490.57/677.49 = 351.45/x
  3. Step 3: Cross multiply
    490.57x = 677.49 × 351.45
  4. Step 4: Simplify right side
    490.57x = 238,103.86
  5. Step 5: Solve for x
    x = 238,103.86/490.57
  6. Step 6: Final answer
    x = 485.36

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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.