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Finding the Third Proportional to 613.50 and 879.75

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Solution

The third proportional to 613.50 and 879.75 is: 1,261.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.50 : 879.75 = 879.75 : x
  2. Step 2: Convert to fraction form
    613.50/879.75 = 879.75/x
  3. Step 3: Cross multiply
    613.50x = 879.75 × 879.75
  4. Step 4: Simplify right side
    613.50x = 773,960.06
  5. Step 5: Solve for x
    x = 773,960.06/613.50
  6. Step 6: Final answer
    x = 1,261.55

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.