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Finding the Third Proportional to 18,780.75 and 28,112.63

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Solution

The third proportional to 18,780.75 and 28,112.63 is: 42,081.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,780.75 : 28,112.63 = 28,112.63 : x
  2. Step 2: Convert to fraction form
    18,780.75/28,112.63 = 28,112.63/x
  3. Step 3: Cross multiply
    18,780.75x = 28,112.63 × 28,112.63
  4. Step 4: Simplify right side
    18,780.75x = 790,319,684.39
  5. Step 5: Solve for x
    x = 790,319,684.39/18,780.75
  6. Step 6: Final answer
    x = 42,081.37

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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.