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Finding the Third Proportional to 5,520 and 7,020

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Solution

The third proportional to 5,520 and 7,020 is: 8,927.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,520 : 7,020 = 7,020 : x
  2. Step 2: Convert to fraction form
    5,520/7,020 = 7,020/x
  3. Step 3: Cross multiply
    5,520x = 7,020 × 7,020
  4. Step 4: Simplify right side
    5,520x = 49,280,400
  5. Step 5: Solve for x
    x = 49,280,400/5,520
  6. Step 6: Final answer
    x = 8,927.61

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Why These Related Problems?

These problems maintain the same ratio (1.27) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.