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Finding the Fourth Proportional to 490.15, 676.11 and 313.15

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Solution

The fourth proportional to 490.15, 676.11 and 313.15 is: 431.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.15 : 676.11 = 313.15 : x
  2. Step 2: Convert to fraction form
    490.15/676.11 = 313.15/x
  3. Step 3: Cross multiply
    490.15x = 676.11 × 313.15
  4. Step 4: Simplify right side
    490.15x = 211,724.60
  5. Step 5: Solve for x
    x = 211,724.60/490.15
  6. Step 6: Final answer
    x = 431.96

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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.