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Finding the Third Proportional to 20,712 and 28,716

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Solution

The third proportional to 20,712 and 28,716 is: 39,813.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,712 : 28,716 = 28,716 : x
  2. Step 2: Convert to fraction form
    20,712/28,716 = 28,716/x
  3. Step 3: Cross multiply
    20,712x = 28,716 × 28,716
  4. Step 4: Simplify right side
    20,712x = 824,608,656
  5. Step 5: Solve for x
    x = 824,608,656/20,712
  6. Step 6: Final answer
    x = 39,813.09

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.