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Finding the Fourth Proportional to 70,940.39, 106,410.97 and 21,020.92

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Solution

The fourth proportional to 70,940.39, 106,410.97 and 21,020.92 is: 31,531.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,940.39 : 106,410.97 = 21,020.92 : x
  2. Step 2: Convert to fraction form
    70,940.39/106,410.97 = 21,020.92/x
  3. Step 3: Cross multiply
    70,940.39x = 106,410.97 × 21,020.92
  4. Step 4: Simplify right side
    70,940.39x = 2,236,856,905.42
  5. Step 5: Solve for x
    x = 2,236,856,905.42/70,940.39
  6. Step 6: Final answer
    x = 31,531.50

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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.