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Finding the Fourth Proportional to 189,681.66, 261,456.65 and 128,408.52

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Solution

The fourth proportional to 189,681.66, 261,456.65 and 128,408.52 is: 176,997.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    189,681.66 : 261,456.65 = 128,408.52 : x
  2. Step 2: Convert to fraction form
    189,681.66/261,456.65 = 128,408.52/x
  3. Step 3: Cross multiply
    189,681.66x = 261,456.65 × 128,408.52
  4. Step 4: Simplify right side
    189,681.66x = 33,573,260,828.62
  5. Step 5: Solve for x
    x = 33,573,260,828.62/189,681.66
  6. Step 6: Final answer
    x = 176,997.93

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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.