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Finding the Fourth Proportional to 128,464.80, 192,610.80 and 68,503.20

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Solution

The fourth proportional to 128,464.80, 192,610.80 and 68,503.20 is: 102,708.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,464.80 : 192,610.80 = 68,503.20 : x
  2. Step 2: Convert to fraction form
    128,464.80/192,610.80 = 68,503.20/x
  3. Step 3: Cross multiply
    128,464.80x = 192,610.80 × 68,503.20
  4. Step 4: Simplify right side
    128,464.80x = 13,194,456,154.56
  5. Step 5: Solve for x
    x = 13,194,456,154.56/128,464.80
  6. Step 6: Final answer
    x = 102,708.73

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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.