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Finding the Third Proportional to 389,312 and 839,392

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Solution

The third proportional to 389,312 and 839,392 is: 1,809,805.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,312 : 839,392 = 839,392 : x
  2. Step 2: Convert to fraction form
    389,312/839,392 = 839,392/x
  3. Step 3: Cross multiply
    389,312x = 839,392 × 839,392
  4. Step 4: Simplify right side
    389,312x = 704,578,929,664
  5. Step 5: Solve for x
    x = 704,578,929,664/389,312
  6. Step 6: Final answer
    x = 1,809,805.32

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.