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Finding the Fourth Proportional to 128,969.61, 193,585.63 and 86,716.77

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Solution

The fourth proportional to 128,969.61, 193,585.63 and 86,716.77 is: 130,163.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,969.61 : 193,585.63 = 86,716.77 : x
  2. Step 2: Convert to fraction form
    128,969.61/193,585.63 = 86,716.77/x
  3. Step 3: Cross multiply
    128,969.61x = 193,585.63 × 86,716.77
  4. Step 4: Simplify right side
    128,969.61x = 16,787,120,552.02
  5. Step 5: Solve for x
    x = 16,787,120,552.02/128,969.61
  6. Step 6: Final answer
    x = 130,163.38

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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.