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Finding the Third Proportional to 660.75 and 993.38

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Solution

The third proportional to 660.75 and 993.38 is: 1,493.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.75 : 993.38 = 993.38 : x
  2. Step 2: Convert to fraction form
    660.75/993.38 = 993.38/x
  3. Step 3: Cross multiply
    660.75x = 993.38 × 993.38
  4. Step 4: Simplify right side
    660.75x = 986,793.89
  5. Step 5: Solve for x
    x = 986,793.89/660.75
  6. Step 6: Final answer
    x = 1,493.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.