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Finding the Fourth Proportional to 331,238.20, 496,857.30 and 81,920.20

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Solution

The fourth proportional to 331,238.20, 496,857.30 and 81,920.20 is: 122,880.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    331,238.20 : 496,857.30 = 81,920.20 : x
  2. Step 2: Convert to fraction form
    331,238.20/496,857.30 = 81,920.20/x
  3. Step 3: Cross multiply
    331,238.20x = 496,857.30 × 81,920.20
  4. Step 4: Simplify right side
    331,238.20x = 40,702,649,387.46
  5. Step 5: Solve for x
    x = 40,702,649,387.46/331,238.20
  6. Step 6: Final answer
    x = 122,880.30

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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.