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Finding the Fourth Proportional to 490.91, 678.11 and 360.59

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Solution

The fourth proportional to 490.91, 678.11 and 360.59 is: 498.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.91 : 678.11 = 360.59 : x
  2. Step 2: Convert to fraction form
    490.91/678.11 = 360.59/x
  3. Step 3: Cross multiply
    490.91x = 678.11 × 360.59
  4. Step 4: Simplify right side
    490.91x = 244,514.49
  5. Step 5: Solve for x
    x = 244,514.49/490.91
  6. Step 6: Final answer
    x = 498.09

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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.