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Finding the Fourth Proportional to 127,862.40, 191,793.60 and 81,321.60

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Solution

The fourth proportional to 127,862.40, 191,793.60 and 81,321.60 is: 121,982.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,862.40 : 191,793.60 = 81,321.60 : x
  2. Step 2: Convert to fraction form
    127,862.40/191,793.60 = 81,321.60/x
  3. Step 3: Cross multiply
    127,862.40x = 191,793.60 × 81,321.60
  4. Step 4: Simplify right side
    127,862.40x = 15,596,962,421.76
  5. Step 5: Solve for x
    x = 15,596,962,421.76/127,862.40
  6. Step 6: Final answer
    x = 121,982.40

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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.