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Finding the Fourth Proportional to 138,982.50, 191,816.44 and 87,999.97

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Solution

The fourth proportional to 138,982.50, 191,816.44 and 87,999.97 is: 121,452.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,982.50 : 191,816.44 = 87,999.97 : x
  2. Step 2: Convert to fraction form
    138,982.50/191,816.44 = 87,999.97/x
  3. Step 3: Cross multiply
    138,982.50x = 191,816.44 × 87,999.97
  4. Step 4: Simplify right side
    138,982.50x = 16,879,840,625.62
  5. Step 5: Solve for x
    x = 16,879,840,625.62/138,982.50
  6. Step 6: Final answer
    x = 121,452.99

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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.