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Finding the Third Proportional to 280,530 and 423,707

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Solution

The third proportional to 280,530 and 423,707 is: 639,958.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,530 : 423,707 = 423,707 : x
  2. Step 2: Convert to fraction form
    280,530/423,707 = 423,707/x
  3. Step 3: Cross multiply
    280,530x = 423,707 × 423,707
  4. Step 4: Simplify right side
    280,530x = 179,527,621,849
  5. Step 5: Solve for x
    x = 179,527,621,849/280,530
  6. Step 6: Final answer
    x = 639,958.73

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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.