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Finding the Fourth Proportional to 138,027.40, 207,069.90 and 78,814.60

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Solution

The fourth proportional to 138,027.40, 207,069.90 and 78,814.60 is: 118,238.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,027.40 : 207,069.90 = 78,814.60 : x
  2. Step 2: Convert to fraction form
    138,027.40/207,069.90 = 78,814.60/x
  3. Step 3: Cross multiply
    138,027.40x = 207,069.90 × 78,814.60
  4. Step 4: Simplify right side
    138,027.40x = 16,320,131,340.54
  5. Step 5: Solve for x
    x = 16,320,131,340.54/138,027.40
  6. Step 6: Final answer
    x = 118,238.34

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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.