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Finding the Fourth Proportional to 831,490.40, 1,245,392.40 and 643,893.60

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Solution

The fourth proportional to 831,490.40, 1,245,392.40 and 643,893.60 is: 964,413.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    831,490.40 : 1,245,392.40 = 643,893.60 : x
  2. Step 2: Convert to fraction form
    831,490.40/1,245,392.40 = 643,893.60/x
  3. Step 3: Cross multiply
    831,490.40x = 1,245,392.40 × 643,893.60
  4. Step 4: Simplify right side
    831,490.40x = 801,900,195,848.64
  5. Step 5: Solve for x
    x = 801,900,195,848.64/831,490.40
  6. Step 6: Final answer
    x = 964,413.05

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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.