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Finding the Third Proportional to 140,905 and 312,195

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Solution

The third proportional to 140,905 and 312,195 is: 691,712.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,905 : 312,195 = 312,195 : x
  2. Step 2: Convert to fraction form
    140,905/312,195 = 312,195/x
  3. Step 3: Cross multiply
    140,905x = 312,195 × 312,195
  4. Step 4: Simplify right side
    140,905x = 97,465,718,025
  5. Step 5: Solve for x
    x = 97,465,718,025/140,905
  6. Step 6: Final answer
    x = 691,712.27

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Why These Related Problems?

These problems maintain the same ratio (2.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.