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Finding the Fourth Proportional to 331,090.80, 496,636.20 and 81,772.80

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Solution

The fourth proportional to 331,090.80, 496,636.20 and 81,772.80 is: 122,659.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    331,090.80 : 496,636.20 = 81,772.80 : x
  2. Step 2: Convert to fraction form
    331,090.80/496,636.20 = 81,772.80/x
  3. Step 3: Cross multiply
    331,090.80x = 496,636.20 × 81,772.80
  4. Step 4: Simplify right side
    331,090.80x = 40,611,332,655.36
  5. Step 5: Solve for x
    x = 40,611,332,655.36/331,090.80
  6. Step 6: Final answer
    x = 122,659.20

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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.