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Finding the Fourth Proportional to 138,896.79, 191,676.55 and 78,466.34

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Solution

The fourth proportional to 138,896.79, 191,676.55 and 78,466.34 is: 108,282.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,896.79 : 191,676.55 = 78,466.34 : x
  2. Step 2: Convert to fraction form
    138,896.79/191,676.55 = 78,466.34/x
  3. Step 3: Cross multiply
    138,896.79x = 191,676.55 × 78,466.34
  4. Step 4: Simplify right side
    138,896.79x = 15,040,156,914.98
  5. Step 5: Solve for x
    x = 15,040,156,914.98/138,896.79
  6. Step 6: Final answer
    x = 108,282.97

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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.