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Finding the Fourth Proportional to 100,713.88, 138,984.14 and 55,391.14

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Solution

The fourth proportional to 100,713.88, 138,984.14 and 55,391.14 is: 76,439.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,713.88 : 138,984.14 = 55,391.14 : x
  2. Step 2: Convert to fraction form
    100,713.88/138,984.14 = 55,391.14/x
  3. Step 3: Cross multiply
    100,713.88x = 138,984.14 × 55,391.14
  4. Step 4: Simplify right side
    100,713.88x = 7,698,489,956.52
  5. Step 5: Solve for x
    x = 7,698,489,956.52/100,713.88
  6. Step 6: Final answer
    x = 76,439.22

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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.