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Finding the Fourth Proportional to 138,293.28, 207,439.92 and 79,087.41

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Solution

The fourth proportional to 138,293.28, 207,439.92 and 79,087.41 is: 118,631.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,293.28 : 207,439.92 = 79,087.41 : x
  2. Step 2: Convert to fraction form
    138,293.28/207,439.92 = 79,087.41/x
  3. Step 3: Cross multiply
    138,293.28x = 207,439.92 × 79,087.41
  4. Step 4: Simplify right side
    138,293.28x = 16,405,886,003.41
  5. Step 5: Solve for x
    x = 16,405,886,003.41/138,293.28
  6. Step 6: Final answer
    x = 118,631.12

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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.