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Finding the Third Proportional to 6,720 and 7,320

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Solution

The third proportional to 6,720 and 7,320 is: 7,973.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,720 : 7,320 = 7,320 : x
  2. Step 2: Convert to fraction form
    6,720/7,320 = 7,320/x
  3. Step 3: Cross multiply
    6,720x = 7,320 × 7,320
  4. Step 4: Simplify right side
    6,720x = 53,582,400
  5. Step 5: Solve for x
    x = 53,582,400/6,720
  6. Step 6: Final answer
    x = 7,973.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.