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Finding the Fourth Proportional to 72,438.60, 108,657.90 and 54,942.60

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Solution

The fourth proportional to 72,438.60, 108,657.90 and 54,942.60 is: 82,413.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,438.60 : 108,657.90 = 54,942.60 : x
  2. Step 2: Convert to fraction form
    72,438.60/108,657.90 = 54,942.60/x
  3. Step 3: Cross multiply
    72,438.60x = 108,657.90 × 54,942.60
  4. Step 4: Simplify right side
    72,438.60x = 5,969,947,536.54
  5. Step 5: Solve for x
    x = 5,969,947,536.54/72,438.60
  6. Step 6: Final answer
    x = 82,413.90

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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.