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Finding the Fourth Proportional to 80,108.21, 120,169.13 and 20,943.78

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Solution

The fourth proportional to 80,108.21, 120,169.13 and 20,943.78 is: 31,417.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,108.21 : 120,169.13 = 20,943.78 : x
  2. Step 2: Convert to fraction form
    80,108.21/120,169.13 = 20,943.78/x
  3. Step 3: Cross multiply
    80,108.21x = 120,169.13 × 20,943.78
  4. Step 4: Simplify right side
    80,108.21x = 2,516,796,121.93
  5. Step 5: Solve for x
    x = 2,516,796,121.93/80,108.21
  6. Step 6: Final answer
    x = 31,417.46

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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.