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Finding the Third Proportional to 142,940 and 313,879

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Solution

The third proportional to 142,940 and 313,879 is: 689,240.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,940 : 313,879 = 313,879 : x
  2. Step 2: Convert to fraction form
    142,940/313,879 = 313,879/x
  3. Step 3: Cross multiply
    142,940x = 313,879 × 313,879
  4. Step 4: Simplify right side
    142,940x = 98,520,026,641
  5. Step 5: Solve for x
    x = 98,520,026,641/142,940
  6. Step 6: Final answer
    x = 689,240.43

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.