Home / 128,239.38-192,353.28-86,137.20

Finding the Fourth Proportional to 128,239.38, 192,353.28 and 86,137.20

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Solution

The fourth proportional to 128,239.38, 192,353.28 and 86,137.20 is: 129,201.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,239.38 : 192,353.28 = 86,137.20 : x
  2. Step 2: Convert to fraction form
    128,239.38/192,353.28 = 86,137.20/x
  3. Step 3: Cross multiply
    128,239.38x = 192,353.28 × 86,137.20
  4. Step 4: Simplify right side
    128,239.38x = 16,568,772,950.02
  5. Step 5: Solve for x
    x = 16,568,772,950.02/128,239.38
  6. Step 6: Final answer
    x = 129,201.91

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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.