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Finding the Fourth Proportional to 128,318.39, 192,373.60 and 53,494.64

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Solution

The fourth proportional to 128,318.39, 192,373.60 and 53,494.64 is: 80,198.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,318.39 : 192,373.60 = 53,494.64 : x
  2. Step 2: Convert to fraction form
    128,318.39/192,373.60 = 53,494.64/x
  3. Step 3: Cross multiply
    128,318.39x = 192,373.60 × 53,494.64
  4. Step 4: Simplify right side
    128,318.39x = 10,290,956,477.50
  5. Step 5: Solve for x
    x = 10,290,956,477.50/128,318.39
  6. Step 6: Final answer
    x = 80,198.61

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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.