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Finding the Third Proportional to 300.75 and 490.13

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Solution

The third proportional to 300.75 and 490.13 is: 798.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    300.75 : 490.13 = 490.13 : x
  2. Step 2: Convert to fraction form
    300.75/490.13 = 490.13/x
  3. Step 3: Cross multiply
    300.75x = 490.13 × 490.13
  4. Step 4: Simplify right side
    300.75x = 240,222.52
  5. Step 5: Solve for x
    x = 240,222.52/300.75
  6. Step 6: Final answer
    x = 798.74

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Why These Related Problems?

These problems maintain the same ratio (1.63) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.