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Finding the Third Proportional to 4,200 and 4,620

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Solution

The third proportional to 4,200 and 4,620 is: 5,082

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,200 : 4,620 = 4,620 : x
  2. Step 2: Convert to fraction form
    4,200/4,620 = 4,620/x
  3. Step 3: Cross multiply
    4,200x = 4,620 × 4,620
  4. Step 4: Simplify right side
    4,200x = 21,344,400
  5. Step 5: Solve for x
    x = 21,344,400/4,200
  6. Step 6: Final answer
    x = 5,082

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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.