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Finding the Third Proportional to 356 and 490.75

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Solution

The third proportional to 356 and 490.75 is: 676.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    356 : 490.75 = 490.75 : x
  2. Step 2: Convert to fraction form
    356/490.75 = 490.75/x
  3. Step 3: Cross multiply
    356x = 490.75 × 490.75
  4. Step 4: Simplify right side
    356x = 240,835.56
  5. Step 5: Solve for x
    x = 240,835.56/356
  6. Step 6: Final answer
    x = 676.50

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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.