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Finding the Third Proportional to 312.96 and 490.92

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Solution

The third proportional to 312.96 and 490.92 is: 770.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.96 : 490.92 = 490.92 : x
  2. Step 2: Convert to fraction form
    312.96/490.92 = 490.92/x
  3. Step 3: Cross multiply
    312.96x = 490.92 × 490.92
  4. Step 4: Simplify right side
    312.96x = 240,998.53
  5. Step 5: Solve for x
    x = 240,998.53/312.96
  6. Step 6: Final answer
    x = 770.07

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.