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Finding the Third Proportional to 3,240 and 4,920

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Solution

The third proportional to 3,240 and 4,920 is: 7,471.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,240 : 4,920 = 4,920 : x
  2. Step 2: Convert to fraction form
    3,240/4,920 = 4,920/x
  3. Step 3: Cross multiply
    3,240x = 4,920 × 4,920
  4. Step 4: Simplify right side
    3,240x = 24,206,400
  5. Step 5: Solve for x
    x = 24,206,400/3,240
  6. Step 6: Final answer
    x = 7,471.11

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.