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Finding the Fourth Proportional to 206,611, 309,887.40 and 66,351.40

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Solution

The fourth proportional to 206,611, 309,887.40 and 66,351.40 is: 99,517.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,611 : 309,887.40 = 66,351.40 : x
  2. Step 2: Convert to fraction form
    206,611/309,887.40 = 66,351.40/x
  3. Step 3: Cross multiply
    206,611x = 309,887.40 × 66,351.40
  4. Step 4: Simplify right side
    206,611x = 20,561,462,832.36
  5. Step 5: Solve for x
    x = 20,561,462,832.36/206,611
  6. Step 6: Final answer
    x = 99,517.75

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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.