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Finding the Third Proportional to 4,689 and 7,321

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Solution

The third proportional to 4,689 and 7,321 is: 11,430.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,689 : 7,321 = 7,321 : x
  2. Step 2: Convert to fraction form
    4,689/7,321 = 7,321/x
  3. Step 3: Cross multiply
    4,689x = 7,321 × 7,321
  4. Step 4: Simplify right side
    4,689x = 53,597,041
  5. Step 5: Solve for x
    x = 53,597,041/4,689
  6. Step 6: Final answer
    x = 11,430.38

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.