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Finding the Third Proportional to 4,921 and 7,629

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Solution

The third proportional to 4,921 and 7,629 is: 11,827.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,921 : 7,629 = 7,629 : x
  2. Step 2: Convert to fraction form
    4,921/7,629 = 7,629/x
  3. Step 3: Cross multiply
    4,921x = 7,629 × 7,629
  4. Step 4: Simplify right side
    4,921x = 58,201,641
  5. Step 5: Solve for x
    x = 58,201,641/4,921
  6. Step 6: Final answer
    x = 11,827.20

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.