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Finding the Fourth Proportional to 100,863.56, 139,190.54 and 55,540.60

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Solution

The fourth proportional to 100,863.56, 139,190.54 and 55,540.60 is: 76,645.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,863.56 : 139,190.54 = 55,540.60 : x
  2. Step 2: Convert to fraction form
    100,863.56/139,190.54 = 55,540.60/x
  3. Step 3: Cross multiply
    100,863.56x = 139,190.54 × 55,540.60
  4. Step 4: Simplify right side
    100,863.56x = 7,730,726,105.92
  5. Step 5: Solve for x
    x = 7,730,726,105.92/100,863.56
  6. Step 6: Final answer
    x = 76,645.38

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1.5x scale

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.