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Finding the Fourth Proportional to 100,236.57, 138,330.62 and 54,918.48

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Solution

The fourth proportional to 100,236.57, 138,330.62 and 54,918.48 is: 75,789.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,236.57 : 138,330.62 = 54,918.48 : x
  2. Step 2: Convert to fraction form
    100,236.57/138,330.62 = 54,918.48/x
  3. Step 3: Cross multiply
    100,236.57x = 138,330.62 × 54,918.48
  4. Step 4: Simplify right side
    100,236.57x = 7,596,907,387.86
  5. Step 5: Solve for x
    x = 7,596,907,387.86/100,236.57
  6. Step 6: Final answer
    x = 75,789.78

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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.