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Finding the Third Proportional to 1,986 and 4,272

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Solution

The third proportional to 1,986 and 4,272 is: 9,189.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986 : 4,272 = 4,272 : x
  2. Step 2: Convert to fraction form
    1,986/4,272 = 4,272/x
  3. Step 3: Cross multiply
    1,986x = 4,272 × 4,272
  4. Step 4: Simplify right side
    1,986x = 18,249,984
  5. Step 5: Solve for x
    x = 18,249,984/1,986
  6. Step 6: Final answer
    x = 9,189.32

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.