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Finding the Third Proportional to 12,991 and 28,411

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Solution

The third proportional to 12,991 and 28,411 is: 62,134.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,991 : 28,411 = 28,411 : x
  2. Step 2: Convert to fraction form
    12,991/28,411 = 28,411/x
  3. Step 3: Cross multiply
    12,991x = 28,411 × 28,411
  4. Step 4: Simplify right side
    12,991x = 807,184,921
  5. Step 5: Solve for x
    x = 807,184,921/12,991
  6. Step 6: Final answer
    x = 62,134.16

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.