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Finding the Third Proportional to 279,731.50 and 421,919.75

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Solution

The third proportional to 279,731.50 and 421,919.75 is: 636,382.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,731.50 : 421,919.75 = 421,919.75 : x
  2. Step 2: Convert to fraction form
    279,731.50/421,919.75 = 421,919.75/x
  3. Step 3: Cross multiply
    279,731.50x = 421,919.75 × 421,919.75
  4. Step 4: Simplify right side
    279,731.50x = 178,016,275,440.06
  5. Step 5: Solve for x
    x = 178,016,275,440.06/279,731.50
  6. Step 6: Final answer
    x = 636,382.66

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.