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Finding the Fourth Proportional to 490.79, 676.95 and 343.46

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Solution

The fourth proportional to 490.79, 676.95 and 343.46 is: 473.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    490.79 : 676.95 = 343.46 : x
  2. Step 2: Convert to fraction form
    490.79/676.95 = 343.46/x
  3. Step 3: Cross multiply
    490.79x = 676.95 × 343.46
  4. Step 4: Simplify right side
    490.79x = 232,505.25
  5. Step 5: Solve for x
    x = 232,505.25/490.79
  6. Step 6: Final answer
    x = 473.74

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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.