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Finding the Fourth Proportional to 128,801.99, 177,713.11 and 74,340.83

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Solution

The fourth proportional to 128,801.99, 177,713.11 and 74,340.83 is: 102,570.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,801.99 : 177,713.11 = 74,340.83 : x
  2. Step 2: Convert to fraction form
    128,801.99/177,713.11 = 74,340.83/x
  3. Step 3: Cross multiply
    128,801.99x = 177,713.11 × 74,340.83
  4. Step 4: Simplify right side
    128,801.99x = 13,211,340,099.28
  5. Step 5: Solve for x
    x = 13,211,340,099.28/128,801.99
  6. Step 6: Final answer
    x = 102,570.93

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.