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Finding the Fourth Proportional to 72,618.78, 100,211.92 and 40,352.57

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Solution

The fourth proportional to 72,618.78, 100,211.92 and 40,352.57 is: 55,685.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,618.78 : 100,211.92 = 40,352.57 : x
  2. Step 2: Convert to fraction form
    72,618.78/100,211.92 = 40,352.57/x
  3. Step 3: Cross multiply
    72,618.78x = 100,211.92 × 40,352.57
  4. Step 4: Simplify right side
    72,618.78x = 4,043,807,914.69
  5. Step 5: Solve for x
    x = 4,043,807,914.69/72,618.78
  6. Step 6: Final answer
    x = 55,685.43

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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.