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Finding the Fourth Proportional to 490.34, 676.45 and 313.36

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Solution

The fourth proportional to 490.34, 676.45 and 313.36 is: 432.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.34 : 676.45 = 313.36 : x
  2. Step 2: Convert to fraction form
    490.34/676.45 = 313.36/x
  3. Step 3: Cross multiply
    490.34x = 676.45 × 313.36
  4. Step 4: Simplify right side
    490.34x = 211,972.37
  5. Step 5: Solve for x
    x = 211,972.37/490.34
  6. Step 6: Final answer
    x = 432.30

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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.