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Finding the Fourth Proportional to 808,640.40, 1,212,960.60 and 798,142.80

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Solution

The fourth proportional to 808,640.40, 1,212,960.60 and 798,142.80 is: 1,197,214.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    808,640.40 : 1,212,960.60 = 798,142.80 : x
  2. Step 2: Convert to fraction form
    808,640.40/1,212,960.60 = 798,142.80/x
  3. Step 3: Cross multiply
    808,640.40x = 1,212,960.60 × 798,142.80
  4. Step 4: Simplify right side
    808,640.40x = 968,115,769,573.68
  5. Step 5: Solve for x
    x = 968,115,769,573.68/808,640.40
  6. Step 6: Final answer
    x = 1,197,214.20

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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.