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Finding the Fourth Proportional to 206,412.30, 309,618.45 and 81,753.30

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Solution

The fourth proportional to 206,412.30, 309,618.45 and 81,753.30 is: 122,629.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,412.30 : 309,618.45 = 81,753.30 : x
  2. Step 2: Convert to fraction form
    206,412.30/309,618.45 = 81,753.30/x
  3. Step 3: Cross multiply
    206,412.30x = 309,618.45 × 81,753.30
  4. Step 4: Simplify right side
    206,412.30x = 25,312,330,028.39
  5. Step 5: Solve for x
    x = 25,312,330,028.39/206,412.30
  6. Step 6: Final answer
    x = 122,629.95

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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.