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Finding the Fourth Proportional to 138,960.60, 191,797.11 and 78,566.22

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Solution

The fourth proportional to 138,960.60, 191,797.11 and 78,566.22 is: 108,439.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,960.60 : 191,797.11 = 78,566.22 : x
  2. Step 2: Convert to fraction form
    138,960.60/191,797.11 = 78,566.22/x
  3. Step 3: Cross multiply
    138,960.60x = 191,797.11 × 78,566.22
  4. Step 4: Simplify right side
    138,960.60x = 15,068,773,939.62
  5. Step 5: Solve for x
    x = 15,068,773,939.62/138,960.60
  6. Step 6: Final answer
    x = 108,439.18

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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.