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Finding the Third Proportional to 7,720 and 8,440

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Solution

The third proportional to 7,720 and 8,440 is: 9,227.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,720 : 8,440 = 8,440 : x
  2. Step 2: Convert to fraction form
    7,720/8,440 = 8,440/x
  3. Step 3: Cross multiply
    7,720x = 8,440 × 8,440
  4. Step 4: Simplify right side
    7,720x = 71,233,600
  5. Step 5: Solve for x
    x = 71,233,600/7,720
  6. Step 6: Final answer
    x = 9,227.15

Related Problems

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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.