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Finding the Fourth Proportional to 138,906.60, 191,772.90 and 91,243.08

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Solution

The fourth proportional to 138,906.60, 191,772.90 and 91,243.08 is: 125,969.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,906.60 : 191,772.90 = 91,243.08 : x
  2. Step 2: Convert to fraction form
    138,906.60/191,772.90 = 91,243.08/x
  3. Step 3: Cross multiply
    138,906.60x = 191,772.90 × 91,243.08
  4. Step 4: Simplify right side
    138,906.60x = 17,497,950,056.53
  5. Step 5: Solve for x
    x = 17,497,950,056.53/138,906.60
  6. Step 6: Final answer
    x = 125,969.18

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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.