Home / 128,214.60-192,321.90-57,137.10

Finding the Fourth Proportional to 128,214.60, 192,321.90 and 57,137.10

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Solution

The fourth proportional to 128,214.60, 192,321.90 and 57,137.10 is: 85,705.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,214.60 : 192,321.90 = 57,137.10 : x
  2. Step 2: Convert to fraction form
    128,214.60/192,321.90 = 57,137.10/x
  3. Step 3: Cross multiply
    128,214.60x = 192,321.90 × 57,137.10
  4. Step 4: Simplify right side
    128,214.60x = 10,988,715,632.49
  5. Step 5: Solve for x
    x = 10,988,715,632.49/128,214.60
  6. Step 6: Final answer
    x = 85,705.65

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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.