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Finding the Fourth Proportional to 139,129.66, 191,997.57 and 75,466.54

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Solution

The fourth proportional to 139,129.66, 191,997.57 and 75,466.54 is: 104,143.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,129.66 : 191,997.57 = 75,466.54 : x
  2. Step 2: Convert to fraction form
    139,129.66/191,997.57 = 75,466.54/x
  3. Step 3: Cross multiply
    139,129.66x = 191,997.57 × 75,466.54
  4. Step 4: Simplify right side
    139,129.66x = 14,489,392,296.31
  5. Step 5: Solve for x
    x = 14,489,392,296.31/139,129.66
  6. Step 6: Final answer
    x = 104,143.09

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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.