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Finding the Fourth Proportional to 85,866.70, 128,800.05 and 81,028.30

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Solution

The fourth proportional to 85,866.70, 128,800.05 and 81,028.30 is: 121,542.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,866.70 : 128,800.05 = 81,028.30 : x
  2. Step 2: Convert to fraction form
    85,866.70/128,800.05 = 81,028.30/x
  3. Step 3: Cross multiply
    85,866.70x = 128,800.05 × 81,028.30
  4. Step 4: Simplify right side
    85,866.70x = 10,436,449,091.42
  5. Step 5: Solve for x
    x = 10,436,449,091.42/85,866.70
  6. Step 6: Final answer
    x = 121,542.45

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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.