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Finding the Fourth Proportional to 81,912.80, 122,638.80 and 73,618.40

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Solution

The fourth proportional to 81,912.80, 122,638.80 and 73,618.40 is: 110,220.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,912.80 : 122,638.80 = 73,618.40 : x
  2. Step 2: Convert to fraction form
    81,912.80/122,638.80 = 73,618.40/x
  3. Step 3: Cross multiply
    81,912.80x = 122,638.80 × 73,618.40
  4. Step 4: Simplify right side
    81,912.80x = 9,028,472,233.92
  5. Step 5: Solve for x
    x = 9,028,472,233.92/81,912.80
  6. Step 6: Final answer
    x = 110,220.53

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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.