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Finding the Fourth Proportional to 171,639.61, 257,124.22 and 81,554.11

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Solution

The fourth proportional to 171,639.61, 257,124.22 and 81,554.11 is: 122,171.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    171,639.61 : 257,124.22 = 81,554.11 : x
  2. Step 2: Convert to fraction form
    171,639.61/257,124.22 = 81,554.11/x
  3. Step 3: Cross multiply
    171,639.61x = 257,124.22 × 81,554.11
  4. Step 4: Simplify right side
    171,639.61x = 20,969,536,921.54
  5. Step 5: Solve for x
    x = 20,969,536,921.54/171,639.61
  6. Step 6: Final answer
    x = 122,171.90

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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.