Home / 128,906.20-193,359.30-86,915.80

Finding the Fourth Proportional to 128,906.20, 193,359.30 and 86,915.80

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Solution

The fourth proportional to 128,906.20, 193,359.30 and 86,915.80 is: 130,373.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,906.20 : 193,359.30 = 86,915.80 : x
  2. Step 2: Convert to fraction form
    128,906.20/193,359.30 = 86,915.80/x
  3. Step 3: Cross multiply
    128,906.20x = 193,359.30 × 86,915.80
  4. Step 4: Simplify right side
    128,906.20x = 16,805,978,246.94
  5. Step 5: Solve for x
    x = 16,805,978,246.94/128,906.20
  6. Step 6: Final answer
    x = 130,373.70

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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.