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Finding the Fourth Proportional to 87,978.18, 131,969.44 and 28,811.46

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Solution

The fourth proportional to 87,978.18, 131,969.44 and 28,811.46 is: 43,217.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,978.18 : 131,969.44 = 28,811.46 : x
  2. Step 2: Convert to fraction form
    87,978.18/131,969.44 = 28,811.46/x
  3. Step 3: Cross multiply
    87,978.18x = 131,969.44 × 28,811.46
  4. Step 4: Simplify right side
    87,978.18x = 3,802,232,610.62
  5. Step 5: Solve for x
    x = 3,802,232,610.62/87,978.18
  6. Step 6: Final answer
    x = 43,217.90

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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.