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Finding the Fourth Proportional to 209,212.70, 313,819.05 and 68,953.10

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Solution

The fourth proportional to 209,212.70, 313,819.05 and 68,953.10 is: 103,429.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,212.70 : 313,819.05 = 68,953.10 : x
  2. Step 2: Convert to fraction form
    209,212.70/313,819.05 = 68,953.10/x
  3. Step 3: Cross multiply
    209,212.70x = 313,819.05 × 68,953.10
  4. Step 4: Simplify right side
    209,212.70x = 21,638,796,336.56
  5. Step 5: Solve for x
    x = 21,638,796,336.56/209,212.70
  6. Step 6: Final answer
    x = 103,429.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.