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Finding the Fourth Proportional to 206,979.45, 310,305.15 and 113,485.20

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Solution

The fourth proportional to 206,979.45, 310,305.15 and 113,485.20 is: 170,137.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,979.45 : 310,305.15 = 113,485.20 : x
  2. Step 2: Convert to fraction form
    206,979.45/310,305.15 = 113,485.20/x
  3. Step 3: Cross multiply
    206,979.45x = 310,305.15 × 113,485.20
  4. Step 4: Simplify right side
    206,979.45x = 35,215,042,008.78
  5. Step 5: Solve for x
    x = 35,215,042,008.78/206,979.45
  6. Step 6: Final answer
    x = 170,137.87

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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.