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Finding the Fourth Proportional to 100,399.73, 138,549.22 and 55,077.31

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Solution

The fourth proportional to 100,399.73, 138,549.22 and 55,077.31 is: 76,005.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,399.73 : 138,549.22 = 55,077.31 : x
  2. Step 2: Convert to fraction form
    100,399.73/138,549.22 = 55,077.31/x
  3. Step 3: Cross multiply
    100,399.73x = 138,549.22 × 55,077.31
  4. Step 4: Simplify right side
    100,399.73x = 7,630,918,340.20
  5. Step 5: Solve for x
    x = 7,630,918,340.20/100,399.73
  6. Step 6: Final answer
    x = 76,005.37

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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.