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Finding the Fourth Proportional to 206,639.32, 309,959 and 66,496.36

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Solution

The fourth proportional to 206,639.32, 309,959 and 66,496.36 is: 99,744.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,639.32 : 309,959 = 66,496.36 : x
  2. Step 2: Convert to fraction form
    206,639.32/309,959 = 66,496.36/x
  3. Step 3: Cross multiply
    206,639.32x = 309,959 × 66,496.36
  4. Step 4: Simplify right side
    206,639.32x = 20,611,145,249.24
  5. Step 5: Solve for x
    x = 20,611,145,249.24/206,639.32
  6. Step 6: Final answer
    x = 99,744.55

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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.