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Finding the Fourth Proportional to 515,764,911.60, 773,647,367.40 and 485,506,940.40

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Solution

The fourth proportional to 515,764,911.60, 773,647,367.40 and 485,506,940.40 is: 728,260,410.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,764,911.60 : 773,647,367.40 = 485,506,940.40 : x
  2. Step 2: Convert to fraction form
    515,764,911.60/773,647,367.40 = 485,506,940.40/x
  3. Step 3: Cross multiply
    515,764,911.60x = 773,647,367.40 × 485,506,940.40
  4. Step 4: Simplify right side
    515,764,911.60x = 375,611,166,294,888,704
  5. Step 5: Solve for x
    x = 375,611,166,294,888,704/515,764,911.60
  6. Step 6: Final answer
    x = 728,260,410.60

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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.