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Finding the Fourth Proportional to 72,669.60, 108,745.20 and 50,378.40

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Solution

The fourth proportional to 72,669.60, 108,745.20 and 50,378.40 is: 75,387.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,669.60 : 108,745.20 = 50,378.40 : x
  2. Step 2: Convert to fraction form
    72,669.60/108,745.20 = 50,378.40/x
  3. Step 3: Cross multiply
    72,669.60x = 108,745.20 × 50,378.40
  4. Step 4: Simplify right side
    72,669.60x = 5,478,409,183.68
  5. Step 5: Solve for x
    x = 5,478,409,183.68/72,669.60
  6. Step 6: Final answer
    x = 75,387.91

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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.