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Finding the Fourth Proportional to 100,713.58, 138,981.81 and 55,391.38

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Solution

The fourth proportional to 100,713.58, 138,981.81 and 55,391.38 is: 76,438.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,713.58 : 138,981.81 = 55,391.38 : x
  2. Step 2: Convert to fraction form
    100,713.58/138,981.81 = 55,391.38/x
  3. Step 3: Cross multiply
    100,713.58x = 138,981.81 × 55,391.38
  4. Step 4: Simplify right side
    100,713.58x = 7,698,394,250.80
  5. Step 5: Solve for x
    x = 7,698,394,250.80/100,713.58
  6. Step 6: Final answer
    x = 76,438.49

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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.