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Finding the Fourth Proportional to 207,266.70, 311,130.46 and 128,469.90

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Solution

The fourth proportional to 207,266.70, 311,130.46 and 128,469.90 is: 192,847.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,266.70 : 311,130.46 = 128,469.90 : x
  2. Step 2: Convert to fraction form
    207,266.70/311,130.46 = 128,469.90/x
  3. Step 3: Cross multiply
    207,266.70x = 311,130.46 × 128,469.90
  4. Step 4: Simplify right side
    207,266.70x = 39,970,899,083.15
  5. Step 5: Solve for x
    x = 39,970,899,083.15/207,266.70
  6. Step 6: Final answer
    x = 192,847.66

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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.