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Finding the Fourth Proportional to 206,629.60, 309,997.20 and 66,389.60

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Solution

The fourth proportional to 206,629.60, 309,997.20 and 66,389.60 is: 99,601.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,629.60 : 309,997.20 = 66,389.60 : x
  2. Step 2: Convert to fraction form
    206,629.60/309,997.20 = 66,389.60/x
  3. Step 3: Cross multiply
    206,629.60x = 309,997.20 × 66,389.60
  4. Step 4: Simplify right side
    206,629.60x = 20,580,590,109.12
  5. Step 5: Solve for x
    x = 20,580,590,109.12/206,629.60
  6. Step 6: Final answer
    x = 99,601.36

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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.