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Finding the Fourth Proportional to 128,665.80, 192,912.30 and 68,704.20

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Solution

The fourth proportional to 128,665.80, 192,912.30 and 68,704.20 is: 103,010.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,665.80 : 192,912.30 = 68,704.20 : x
  2. Step 2: Convert to fraction form
    128,665.80/192,912.30 = 68,704.20/x
  3. Step 3: Cross multiply
    128,665.80x = 192,912.30 × 68,704.20
  4. Step 4: Simplify right side
    128,665.80x = 13,253,885,241.66
  5. Step 5: Solve for x
    x = 13,253,885,241.66/128,665.80
  6. Step 6: Final answer
    x = 103,010.16

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1.5x scale

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.