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Finding the Fourth Proportional to 206,628.60, 309,995.70 and 66,388.60

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Solution

The fourth proportional to 206,628.60, 309,995.70 and 66,388.60 is: 99,599.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,628.60 : 309,995.70 = 66,388.60 : x
  2. Step 2: Convert to fraction form
    206,628.60/309,995.70 = 66,388.60/x
  3. Step 3: Cross multiply
    206,628.60x = 309,995.70 × 66,388.60
  4. Step 4: Simplify right side
    206,628.60x = 20,580,180,529.02
  5. Step 5: Solve for x
    x = 20,580,180,529.02/206,628.60
  6. Step 6: Final answer
    x = 99,599.86

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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.