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Finding the Third Proportional to 1,698 and 4,221

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Solution

The third proportional to 1,698 and 4,221 is: 10,492.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,698 : 4,221 = 4,221 : x
  2. Step 2: Convert to fraction form
    1,698/4,221 = 4,221/x
  3. Step 3: Cross multiply
    1,698x = 4,221 × 4,221
  4. Step 4: Simplify right side
    1,698x = 17,816,841
  5. Step 5: Solve for x
    x = 17,816,841/1,698
  6. Step 6: Final answer
    x = 10,492.84

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Why These Related Problems?

These problems maintain the same ratio (2.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.