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Finding the Fourth Proportional to 408,042.20, 612,149.70 and 123,709.40

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Solution

The fourth proportional to 408,042.20, 612,149.70 and 123,709.40 is: 185,590.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,042.20 : 612,149.70 = 123,709.40 : x
  2. Step 2: Convert to fraction form
    408,042.20/612,149.70 = 123,709.40/x
  3. Step 3: Cross multiply
    408,042.20x = 612,149.70 × 123,709.40
  4. Step 4: Simplify right side
    408,042.20x = 75,728,672,097.18
  5. Step 5: Solve for x
    x = 75,728,672,097.18/408,042.20
  6. Step 6: Final answer
    x = 185,590.29

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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.