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Finding the Fourth Proportional to 831,840.80, 1,247,761.20 and 819,399.20

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Solution

The fourth proportional to 831,840.80, 1,247,761.20 and 819,399.20 is: 1,229,098.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    831,840.80 : 1,247,761.20 = 819,399.20 : x
  2. Step 2: Convert to fraction form
    831,840.80/1,247,761.20 = 819,399.20/x
  3. Step 3: Cross multiply
    831,840.80x = 1,247,761.20 × 819,399.20
  4. Step 4: Simplify right side
    831,840.80x = 1,022,414,529,071.04
  5. Step 5: Solve for x
    x = 1,022,414,529,071.04/831,840.80
  6. Step 6: Final answer
    x = 1,229,098.80

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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.