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Finding the Fourth Proportional to 70,520.68, 105,790.89 and 20,604.43

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Solution

The fourth proportional to 70,520.68, 105,790.89 and 20,604.43 is: 30,909.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,520.68 : 105,790.89 = 20,604.43 : x
  2. Step 2: Convert to fraction form
    70,520.68/105,790.89 = 20,604.43/x
  3. Step 3: Cross multiply
    70,520.68x = 105,790.89 × 20,604.43
  4. Step 4: Simplify right side
    70,520.68x = 2,179,760,987.64
  5. Step 5: Solve for x
    x = 2,179,760,987.64/70,520.68
  6. Step 6: Final answer
    x = 30,909.53

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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.