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Finding the Fourth Proportional to 156,789.60, 235,011.60 and 86,719.20

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Solution

The fourth proportional to 156,789.60, 235,011.60 and 86,719.20 is: 129,983.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,789.60 : 235,011.60 = 86,719.20 : x
  2. Step 2: Convert to fraction form
    156,789.60/235,011.60 = 86,719.20/x
  3. Step 3: Cross multiply
    156,789.60x = 235,011.60 × 86,719.20
  4. Step 4: Simplify right side
    156,789.60x = 20,380,017,942.72
  5. Step 5: Solve for x
    x = 20,380,017,942.72/156,789.60
  6. Step 6: Final answer
    x = 129,983.23

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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.