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Finding the Fourth Proportional to 91,243.80, 136,806.30 and 81,912.60

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Solution

The fourth proportional to 91,243.80, 136,806.30 and 81,912.60 is: 122,815.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,243.80 : 136,806.30 = 81,912.60 : x
  2. Step 2: Convert to fraction form
    91,243.80/136,806.30 = 81,912.60/x
  3. Step 3: Cross multiply
    91,243.80x = 136,806.30 × 81,912.60
  4. Step 4: Simplify right side
    91,243.80x = 11,206,159,729.38
  5. Step 5: Solve for x
    x = 11,206,159,729.38/91,243.80
  6. Step 6: Final answer
    x = 122,815.57

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.