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Finding the Fourth Proportional to 100,503.02, 138,694.36 and 55,791.02

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Solution

The fourth proportional to 100,503.02, 138,694.36 and 55,791.02 is: 76,991.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,503.02 : 138,694.36 = 55,791.02 : x
  2. Step 2: Convert to fraction form
    100,503.02/138,694.36 = 55,791.02/x
  3. Step 3: Cross multiply
    100,503.02x = 138,694.36 × 55,791.02
  4. Step 4: Simplify right side
    100,503.02x = 7,737,898,979.70
  5. Step 5: Solve for x
    x = 7,737,898,979.70/100,503.02
  6. Step 6: Final answer
    x = 76,991.71

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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.