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Finding the Fourth Proportional to 161,879.72, 242,889.66 and 86,912.37

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Solution

The fourth proportional to 161,879.72, 242,889.66 and 86,912.37 is: 130,406.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    161,879.72 : 242,889.66 = 86,912.37 : x
  2. Step 2: Convert to fraction form
    161,879.72/242,889.66 = 86,912.37/x
  3. Step 3: Cross multiply
    161,879.72x = 242,889.66 × 86,912.37
  4. Step 4: Simplify right side
    161,879.72x = 21,110,115,999.09
  5. Step 5: Solve for x
    x = 21,110,115,999.09/161,879.72
  6. Step 6: Final answer
    x = 130,406.18

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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.