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Finding the Fourth Proportional to 100,067.40, 138,072.60 and 57,639.60

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Solution

The fourth proportional to 100,067.40, 138,072.60 and 57,639.60 is: 79,530.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,067.40 : 138,072.60 = 57,639.60 : x
  2. Step 2: Convert to fraction form
    100,067.40/138,072.60 = 57,639.60/x
  3. Step 3: Cross multiply
    100,067.40x = 138,072.60 × 57,639.60
  4. Step 4: Simplify right side
    100,067.40x = 7,958,449,434.96
  5. Step 5: Solve for x
    x = 7,958,449,434.96/100,067.40
  6. Step 6: Final answer
    x = 79,530.89

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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.