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Finding the Fourth Proportional to 189,887.68, 261,836.33 and 121,878.96

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Solution

The fourth proportional to 189,887.68, 261,836.33 and 121,878.96 is: 168,059.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    189,887.68 : 261,836.33 = 121,878.96 : x
  2. Step 2: Convert to fraction form
    189,887.68/261,836.33 = 121,878.96/x
  3. Step 3: Cross multiply
    189,887.68x = 261,836.33 × 121,878.96
  4. Step 4: Simplify right side
    189,887.68x = 31,912,340,549.91
  5. Step 5: Solve for x
    x = 31,912,340,549.91/189,887.68
  6. Step 6: Final answer
    x = 168,059.04

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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.