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Finding the Fourth Proportional to 206,759.64, 309,942.48 and 66,419.76

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Solution

The fourth proportional to 206,759.64, 309,942.48 and 66,419.76 is: 99,566.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,759.64 : 309,942.48 = 66,419.76 : x
  2. Step 2: Convert to fraction form
    206,759.64/309,942.48 = 66,419.76/x
  3. Step 3: Cross multiply
    206,759.64x = 309,942.48 × 66,419.76
  4. Step 4: Simplify right side
    206,759.64x = 20,586,305,135.40
  5. Step 5: Solve for x
    x = 20,586,305,135.40/206,759.64
  6. Step 6: Final answer
    x = 99,566.36

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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.