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Finding the Fourth Proportional to 71,912.40, 107,868.60 and 40,419.60

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Solution

The fourth proportional to 71,912.40, 107,868.60 and 40,419.60 is: 60,629.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,912.40 : 107,868.60 = 40,419.60 : x
  2. Step 2: Convert to fraction form
    71,912.40/107,868.60 = 40,419.60/x
  3. Step 3: Cross multiply
    71,912.40x = 107,868.60 × 40,419.60
  4. Step 4: Simplify right side
    71,912.40x = 4,360,005,664.56
  5. Step 5: Solve for x
    x = 4,360,005,664.56/71,912.40
  6. Step 6: Final answer
    x = 60,629.40

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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.