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Finding the Fourth Proportional to 212,410.80, 318,615.39 and 79,324.56

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Solution

The fourth proportional to 212,410.80, 318,615.39 and 79,324.56 is: 118,986.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,410.80 : 318,615.39 = 79,324.56 : x
  2. Step 2: Convert to fraction form
    212,410.80/318,615.39 = 79,324.56/x
  3. Step 3: Cross multiply
    212,410.80x = 318,615.39 × 79,324.56
  4. Step 4: Simplify right side
    212,410.80x = 25,274,025,620.98
  5. Step 5: Solve for x
    x = 25,274,025,620.98/212,410.80
  6. Step 6: Final answer
    x = 118,986.54

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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.