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Finding the Fourth Proportional to 70,881.56, 106,344.92 and 20,961.96

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Solution

The fourth proportional to 70,881.56, 106,344.92 and 20,961.96 is: 31,449.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,881.56 : 106,344.92 = 20,961.96 : x
  2. Step 2: Convert to fraction form
    70,881.56/106,344.92 = 20,961.96/x
  3. Step 3: Cross multiply
    70,881.56x = 106,344.92 × 20,961.96
  4. Step 4: Simplify right side
    70,881.56x = 2,229,197,959.24
  5. Step 5: Solve for x
    x = 2,229,197,959.24/70,881.56
  6. Step 6: Final answer
    x = 31,449.62

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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.