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Finding the Fourth Proportional to 156,786.96, 216,363.96 and 85,169.28

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Solution

The fourth proportional to 156,786.96, 216,363.96 and 85,169.28 is: 117,532.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,786.96 : 216,363.96 = 85,169.28 : x
  2. Step 2: Convert to fraction form
    156,786.96/216,363.96 = 85,169.28/x
  3. Step 3: Cross multiply
    156,786.96x = 216,363.96 × 85,169.28
  4. Step 4: Simplify right side
    156,786.96x = 18,427,562,691.15
  5. Step 5: Solve for x
    x = 18,427,562,691.15/156,786.96
  6. Step 6: Final answer
    x = 117,532.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.