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Finding the Third Proportional to 485.50 and 768.75

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Solution

The third proportional to 485.50 and 768.75 is: 1,217.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.50 : 768.75 = 768.75 : x
  2. Step 2: Convert to fraction form
    485.50/768.75 = 768.75/x
  3. Step 3: Cross multiply
    485.50x = 768.75 × 768.75
  4. Step 4: Simplify right side
    485.50x = 590,976.56
  5. Step 5: Solve for x
    x = 590,976.56/485.50
  6. Step 6: Final answer
    x = 1,217.25

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.