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Finding the Third Proportional to 720 and 1,116

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Solution

The third proportional to 720 and 1,116 is: 1,729.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    720 : 1,116 = 1,116 : x
  2. Step 2: Convert to fraction form
    720/1,116 = 1,116/x
  3. Step 3: Cross multiply
    720x = 1,116 × 1,116
  4. Step 4: Simplify right side
    720x = 1,245,456
  5. Step 5: Solve for x
    x = 1,245,456/720
  6. Step 6: Final answer
    x = 1,729.80

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.