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Finding the Third Proportional to 211,698 and 308,640

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Solution

The third proportional to 211,698 and 308,640 is: 449,974.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    211,698 : 308,640 = 308,640 : x
  2. Step 2: Convert to fraction form
    211,698/308,640 = 308,640/x
  3. Step 3: Cross multiply
    211,698x = 308,640 × 308,640
  4. Step 4: Simplify right side
    211,698x = 95,258,649,600
  5. Step 5: Solve for x
    x = 95,258,649,600/211,698
  6. Step 6: Final answer
    x = 449,974.25

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.