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Finding the Fourth Proportional to 100,530.72, 138,733.86 and 55,212.78

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Solution

The fourth proportional to 100,530.72, 138,733.86 and 55,212.78 is: 76,194.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,530.72 : 138,733.86 = 55,212.78 : x
  2. Step 2: Convert to fraction form
    100,530.72/138,733.86 = 55,212.78/x
  3. Step 3: Cross multiply
    100,530.72x = 138,733.86 × 55,212.78
  4. Step 4: Simplify right side
    100,530.72x = 7,659,882,090.73
  5. Step 5: Solve for x
    x = 7,659,882,090.73/100,530.72
  6. Step 6: Final answer
    x = 76,194.44

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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.