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Finding the Fourth Proportional to 80,156.80, 120,235.20 and 20,998.45

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Solution

The fourth proportional to 80,156.80, 120,235.20 and 20,998.45 is: 31,497.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,156.80 : 120,235.20 = 20,998.45 : x
  2. Step 2: Convert to fraction form
    80,156.80/120,235.20 = 20,998.45/x
  3. Step 3: Cross multiply
    80,156.80x = 120,235.20 × 20,998.45
  4. Step 4: Simplify right side
    80,156.80x = 2,524,752,835.44
  5. Step 5: Solve for x
    x = 2,524,752,835.44/80,156.80
  6. Step 6: Final answer
    x = 31,497.68

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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.