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Finding the Third Proportional to 4,689 and 7,620

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Solution

The third proportional to 4,689 and 7,620 is: 12,383.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,689 : 7,620 = 7,620 : x
  2. Step 2: Convert to fraction form
    4,689/7,620 = 7,620/x
  3. Step 3: Cross multiply
    4,689x = 7,620 × 7,620
  4. Step 4: Simplify right side
    4,689x = 58,064,400
  5. Step 5: Solve for x
    x = 58,064,400/4,689
  6. Step 6: Final answer
    x = 12,383.11

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Why These Related Problems?

These problems maintain the same ratio (1.63) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.