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Finding the Fourth Proportional to 100,912.68, 139,258.82 and 55,589.64

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Solution

The fourth proportional to 100,912.68, 139,258.82 and 55,589.64 is: 76,713.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,912.68 : 139,258.82 = 55,589.64 : x
  2. Step 2: Convert to fraction form
    100,912.68/139,258.82 = 55,589.64/x
  3. Step 3: Cross multiply
    100,912.68x = 139,258.82 × 55,589.64
  4. Step 4: Simplify right side
    100,912.68x = 7,741,347,670.62
  5. Step 5: Solve for x
    x = 7,741,347,670.62/100,912.68
  6. Step 6: Final answer
    x = 76,713.33

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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.