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Finding the Fourth Proportional to 72,481.40, 108,709.46 and 19,173.90

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Solution

The fourth proportional to 72,481.40, 108,709.46 and 19,173.90 is: 28,757.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,481.40 : 108,709.46 = 19,173.90 : x
  2. Step 2: Convert to fraction form
    72,481.40/108,709.46 = 19,173.90/x
  3. Step 3: Cross multiply
    72,481.40x = 108,709.46 × 19,173.90
  4. Step 4: Simplify right side
    72,481.40x = 2,084,384,315.09
  5. Step 5: Solve for x
    x = 2,084,384,315.09/72,481.40
  6. Step 6: Final answer
    x = 28,757.51

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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.