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Finding the Fourth Proportional to 128,777.55, 192,934.64 and 121,180.92

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Solution

The fourth proportional to 128,777.55, 192,934.64 and 121,180.92 is: 181,553.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,777.55 : 192,934.64 = 121,180.92 : x
  2. Step 2: Convert to fraction form
    128,777.55/192,934.64 = 121,180.92/x
  3. Step 3: Cross multiply
    128,777.55x = 192,934.64 × 121,180.92
  4. Step 4: Simplify right side
    128,777.55x = 23,379,996,754.52
  5. Step 5: Solve for x
    x = 23,379,996,754.52/128,777.55
  6. Step 6: Final answer
    x = 181,553.36

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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.