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Finding the Fourth Proportional to 139,361.38, 209,971.82 and 126,049.74

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Solution

The fourth proportional to 139,361.38, 209,971.82 and 126,049.74 is: 189,915.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,361.38 : 209,971.82 = 126,049.74 : x
  2. Step 2: Convert to fraction form
    139,361.38/209,971.82 = 126,049.74/x
  3. Step 3: Cross multiply
    139,361.38x = 209,971.82 × 126,049.74
  4. Step 4: Simplify right side
    139,361.38x = 26,466,893,318.33
  5. Step 5: Solve for x
    x = 26,466,893,318.33/139,361.38
  6. Step 6: Final answer
    x = 189,915.55

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.