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Finding the Fourth Proportional to 128,645.35, 193,181.87 and 86,794.68

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Solution

The fourth proportional to 128,645.35, 193,181.87 and 86,794.68 is: 130,336.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,645.35 : 193,181.87 = 86,794.68 : x
  2. Step 2: Convert to fraction form
    128,645.35/193,181.87 = 86,794.68/x
  3. Step 3: Cross multiply
    128,645.35x = 193,181.87 × 86,794.68
  4. Step 4: Simplify right side
    128,645.35x = 16,767,158,588.45
  5. Step 5: Solve for x
    x = 16,767,158,588.45/128,645.35
  6. Step 6: Final answer
    x = 130,336.30

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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.