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Finding the Fourth Proportional to 80,122.69, 120,190.85 and 20,958.27

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Solution

The fourth proportional to 80,122.69, 120,190.85 and 20,958.27 is: 31,439.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,122.69 : 120,190.85 = 20,958.27 : x
  2. Step 2: Convert to fraction form
    80,122.69/120,190.85 = 20,958.27/x
  3. Step 3: Cross multiply
    80,122.69x = 120,190.85 × 20,958.27
  4. Step 4: Simplify right side
    80,122.69x = 2,518,992,285.83
  5. Step 5: Solve for x
    x = 2,518,992,285.83/80,122.69
  6. Step 6: Final answer
    x = 31,439.19

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1.5x scale

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.