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Finding the Fourth Proportional to 100,227.78, 138,309.39 and 54,905.95

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Solution

The fourth proportional to 100,227.78, 138,309.39 and 54,905.95 is: 75,767.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,227.78 : 138,309.39 = 54,905.95 : x
  2. Step 2: Convert to fraction form
    100,227.78/138,309.39 = 54,905.95/x
  3. Step 3: Cross multiply
    100,227.78x = 138,309.39 × 54,905.95
  4. Step 4: Simplify right side
    100,227.78x = 7,594,008,451.87
  5. Step 5: Solve for x
    x = 7,594,008,451.87/100,227.78
  6. Step 6: Final answer
    x = 75,767.50

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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.