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Finding the Third Proportional to 18,786 and 28,120

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Solution

The third proportional to 18,786 and 28,120 is: 42,091.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,786 : 28,120 = 28,120 : x
  2. Step 2: Convert to fraction form
    18,786/28,120 = 28,120/x
  3. Step 3: Cross multiply
    18,786x = 28,120 × 28,120
  4. Step 4: Simplify right side
    18,786x = 790,734,400
  5. Step 5: Solve for x
    x = 790,734,400/18,786
  6. Step 6: Final answer
    x = 42,091.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.