Home / 128,939.20-193,149.60-86,948.80

Finding the Fourth Proportional to 128,939.20, 193,149.60 and 86,948.80

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Solution

The fourth proportional to 128,939.20, 193,149.60 and 86,948.80 is: 130,248.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,939.20 : 193,149.60 = 86,948.80 : x
  2. Step 2: Convert to fraction form
    128,939.20/193,149.60 = 86,948.80/x
  3. Step 3: Cross multiply
    128,939.20x = 193,149.60 × 86,948.80
  4. Step 4: Simplify right side
    128,939.20x = 16,794,125,940.48
  5. Step 5: Solve for x
    x = 16,794,125,940.48/128,939.20
  6. Step 6: Final answer
    x = 130,248.41

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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.