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Finding the Fourth Proportional to 809,936.60, 1,214,904.90 and 620,979.80

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Solution

The fourth proportional to 809,936.60, 1,214,904.90 and 620,979.80 is: 931,469.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    809,936.60 : 1,214,904.90 = 620,979.80 : x
  2. Step 2: Convert to fraction form
    809,936.60/1,214,904.90 = 620,979.80/x
  3. Step 3: Cross multiply
    809,936.60x = 1,214,904.90 × 620,979.80
  4. Step 4: Simplify right side
    809,936.60x = 754,431,401,821.02
  5. Step 5: Solve for x
    x = 754,431,401,821.02/809,936.60
  6. Step 6: Final answer
    x = 931,469.70

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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.