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Finding the Third Proportional to 207,478 and 320,430

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Solution

The third proportional to 207,478 and 320,430 is: 494,873.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,478 : 320,430 = 320,430 : x
  2. Step 2: Convert to fraction form
    207,478/320,430 = 320,430/x
  3. Step 3: Cross multiply
    207,478x = 320,430 × 320,430
  4. Step 4: Simplify right side
    207,478x = 102,675,384,900
  5. Step 5: Solve for x
    x = 102,675,384,900/207,478
  6. Step 6: Final answer
    x = 494,873.60

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.