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Finding the Third Proportional to 6,580 and 7,220

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Solution

The third proportional to 6,580 and 7,220 is: 7,922.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,580 : 7,220 = 7,220 : x
  2. Step 2: Convert to fraction form
    6,580/7,220 = 7,220/x
  3. Step 3: Cross multiply
    6,580x = 7,220 × 7,220
  4. Step 4: Simplify right side
    6,580x = 52,128,400
  5. Step 5: Solve for x
    x = 52,128,400/6,580
  6. Step 6: Final answer
    x = 7,922.25

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Why These Related Problems?

These problems maintain the same ratio (1.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.