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Finding the Fourth Proportional to 91,953.20, 137,929.80 and 81,930.80

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Solution

The fourth proportional to 91,953.20, 137,929.80 and 81,930.80 is: 122,896.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,953.20 : 137,929.80 = 81,930.80 : x
  2. Step 2: Convert to fraction form
    91,953.20/137,929.80 = 81,930.80/x
  3. Step 3: Cross multiply
    91,953.20x = 137,929.80 × 81,930.80
  4. Step 4: Simplify right side
    91,953.20x = 11,300,698,857.84
  5. Step 5: Solve for x
    x = 11,300,698,857.84/91,953.20
  6. Step 6: Final answer
    x = 122,896.20

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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.