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Finding the Fourth Proportional to 81,940.20, 122,910.30 and 67,165.80

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Solution

The fourth proportional to 81,940.20, 122,910.30 and 67,165.80 is: 100,748.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,940.20 : 122,910.30 = 67,165.80 : x
  2. Step 2: Convert to fraction form
    81,940.20/122,910.30 = 67,165.80/x
  3. Step 3: Cross multiply
    81,940.20x = 122,910.30 × 67,165.80
  4. Step 4: Simplify right side
    81,940.20x = 8,255,368,627.74
  5. Step 5: Solve for x
    x = 8,255,368,627.74/81,940.20
  6. Step 6: Final answer
    x = 100,748.70

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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.