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Finding the Fourth Proportional to 399,489.72, 599,318.42 and 115,179.72

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Solution

The fourth proportional to 399,489.72, 599,318.42 and 115,179.72 is: 172,793.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,489.72 : 599,318.42 = 115,179.72 : x
  2. Step 2: Convert to fraction form
    399,489.72/599,318.42 = 115,179.72/x
  3. Step 3: Cross multiply
    399,489.72x = 599,318.42 × 115,179.72
  4. Step 4: Simplify right side
    399,489.72x = 69,029,328,678.21
  5. Step 5: Solve for x
    x = 69,029,328,678.21/399,489.72
  6. Step 6: Final answer
    x = 172,793.75

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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.