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Finding the Fourth Proportional to 878,469.20, 1,317,703.80 and 783,990.80

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Solution

The fourth proportional to 878,469.20, 1,317,703.80 and 783,990.80 is: 1,175,986.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    878,469.20 : 1,317,703.80 = 783,990.80 : x
  2. Step 2: Convert to fraction form
    878,469.20/1,317,703.80 = 783,990.80/x
  3. Step 3: Cross multiply
    878,469.20x = 1,317,703.80 × 783,990.80
  4. Step 4: Simplify right side
    878,469.20x = 1,033,067,656,325.04
  5. Step 5: Solve for x
    x = 1,033,067,656,325.04/878,469.20
  6. Step 6: Final answer
    x = 1,175,986.20

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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.