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Finding the Third Proportional to 4,620 and 7,390

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Solution

The third proportional to 4,620 and 7,390 is: 11,820.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,620 : 7,390 = 7,390 : x
  2. Step 2: Convert to fraction form
    4,620/7,390 = 7,390/x
  3. Step 3: Cross multiply
    4,620x = 7,390 × 7,390
  4. Step 4: Simplify right side
    4,620x = 54,612,100
  5. Step 5: Solve for x
    x = 54,612,100/4,620
  6. Step 6: Final answer
    x = 11,820.80

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Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.