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Finding the Third Proportional to 425,238 and 639,780

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Solution

The third proportional to 425,238 and 639,780 is: 962,563.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,238 : 639,780 = 639,780 : x
  2. Step 2: Convert to fraction form
    425,238/639,780 = 639,780/x
  3. Step 3: Cross multiply
    425,238x = 639,780 × 639,780
  4. Step 4: Simplify right side
    425,238x = 409,318,448,400
  5. Step 5: Solve for x
    x = 409,318,448,400/425,238
  6. Step 6: Final answer
    x = 962,563.20

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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.