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Finding the Fourth Proportional to 206,479.14, 309,689.52 and 66,219.54

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Solution

The fourth proportional to 206,479.14, 309,689.52 and 66,219.54 is: 99,319.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,479.14 : 309,689.52 = 66,219.54 : x
  2. Step 2: Convert to fraction form
    206,479.14/309,689.52 = 66,219.54/x
  3. Step 3: Cross multiply
    206,479.14x = 309,689.52 × 66,219.54
  4. Step 4: Simplify right side
    206,479.14x = 20,507,497,557.22
  5. Step 5: Solve for x
    x = 20,507,497,557.22/206,479.14
  6. Step 6: Final answer
    x = 99,319.95

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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.