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Finding the Third Proportional to 316,786 and 689,344

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Solution

The third proportional to 316,786 and 689,344 is: 1,500,050.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    316,786 : 689,344 = 689,344 : x
  2. Step 2: Convert to fraction form
    316,786/689,344 = 689,344/x
  3. Step 3: Cross multiply
    316,786x = 689,344 × 689,344
  4. Step 4: Simplify right side
    316,786x = 475,195,150,336
  5. Step 5: Solve for x
    x = 475,195,150,336/316,786
  6. Step 6: Final answer
    x = 1,500,050.98

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.