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Finding the Fourth Proportional to 161,961.70, 242,833.20 and 86,072.80

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Solution

The fourth proportional to 161,961.70, 242,833.20 and 86,072.80 is: 129,051.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    161,961.70 : 242,833.20 = 86,072.80 : x
  2. Step 2: Convert to fraction form
    161,961.70/242,833.20 = 86,072.80/x
  3. Step 3: Cross multiply
    161,961.70x = 242,833.20 × 86,072.80
  4. Step 4: Simplify right side
    161,961.70x = 20,901,333,456.96
  5. Step 5: Solve for x
    x = 20,901,333,456.96/161,961.70
  6. Step 6: Final answer
    x = 129,051.09

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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.