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Finding the Fourth Proportional to 100,679.96, 138,935.40 and 55,357.90

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Solution

The fourth proportional to 100,679.96, 138,935.40 and 55,357.90 is: 76,392.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,679.96 : 138,935.40 = 55,357.90 : x
  2. Step 2: Convert to fraction form
    100,679.96/138,935.40 = 55,357.90/x
  3. Step 3: Cross multiply
    100,679.96x = 138,935.40 × 55,357.90
  4. Step 4: Simplify right side
    100,679.96x = 7,691,171,979.66
  5. Step 5: Solve for x
    x = 7,691,171,979.66/100,679.96
  6. Step 6: Final answer
    x = 76,392.28

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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.