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Finding the Fourth Proportional to 81,629.20, 122,443.80 and 72,443.80

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Solution

The fourth proportional to 81,629.20, 122,443.80 and 72,443.80 is: 108,665.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,629.20 : 122,443.80 = 72,443.80 : x
  2. Step 2: Convert to fraction form
    81,629.20/122,443.80 = 72,443.80/x
  3. Step 3: Cross multiply
    81,629.20x = 122,443.80 × 72,443.80
  4. Step 4: Simplify right side
    81,629.20x = 8,870,294,158.44
  5. Step 5: Solve for x
    x = 8,870,294,158.44/81,629.20
  6. Step 6: Final answer
    x = 108,665.70

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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.