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Finding the Third Proportional to 280,336 and 423,420

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Solution

The third proportional to 280,336 and 423,420 is: 639,534.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,336 : 423,420 = 423,420 : x
  2. Step 2: Convert to fraction form
    280,336/423,420 = 423,420/x
  3. Step 3: Cross multiply
    280,336x = 423,420 × 423,420
  4. Step 4: Simplify right side
    280,336x = 179,284,496,400
  5. Step 5: Solve for x
    x = 179,284,496,400/280,336
  6. Step 6: Final answer
    x = 639,534.33

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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.