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Finding the Third Proportional to 318,430 and 671,420

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Solution

The third proportional to 318,430 and 671,420 is: 1,415,710.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,430 : 671,420 = 671,420 : x
  2. Step 2: Convert to fraction form
    318,430/671,420 = 671,420/x
  3. Step 3: Cross multiply
    318,430x = 671,420 × 671,420
  4. Step 4: Simplify right side
    318,430x = 450,804,816,400
  5. Step 5: Solve for x
    x = 450,804,816,400/318,430
  6. Step 6: Final answer
    x = 1,415,710.88

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.