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Finding the Third Proportional to 38,421 and 78,738.75

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Solution

The third proportional to 38,421 and 78,738.75 is: 161,364.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,421 : 78,738.75 = 78,738.75 : x
  2. Step 2: Convert to fraction form
    38,421/78,738.75 = 78,738.75/x
  3. Step 3: Cross multiply
    38,421x = 78,738.75 × 78,738.75
  4. Step 4: Simplify right side
    38,421x = 6,199,790,751.56
  5. Step 5: Solve for x
    x = 6,199,790,751.56/38,421
  6. Step 6: Final answer
    x = 161,364.64

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Why These Related Problems?

These problems maintain the same ratio (2.05) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.