Home / 128,607.12-192,755.16-66,243.60

Finding the Fourth Proportional to 128,607.12, 192,755.16 and 66,243.60

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Solution

The fourth proportional to 128,607.12, 192,755.16 and 66,243.60 is: 99,285.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,607.12 : 192,755.16 = 66,243.60 : x
  2. Step 2: Convert to fraction form
    128,607.12/192,755.16 = 66,243.60/x
  3. Step 3: Cross multiply
    128,607.12x = 192,755.16 × 66,243.60
  4. Step 4: Simplify right side
    128,607.12x = 12,768,795,716.98
  5. Step 5: Solve for x
    x = 12,768,795,716.98/128,607.12
  6. Step 6: Final answer
    x = 99,285.29

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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.