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Finding the Third Proportional to 991 and 1,272

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Solution

The third proportional to 991 and 1,272 is: 1,632.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    991 : 1,272 = 1,272 : x
  2. Step 2: Convert to fraction form
    991/1,272 = 1,272/x
  3. Step 3: Cross multiply
    991x = 1,272 × 1,272
  4. Step 4: Simplify right side
    991x = 1,617,984
  5. Step 5: Solve for x
    x = 1,617,984/991
  6. Step 6: Final answer
    x = 1,632.68

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Why These Related Problems?

These problems maintain the same ratio (1.28) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.