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Finding the Fourth Proportional to 485,622.40, 728,433.60 and 317,660.80

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Solution

The fourth proportional to 485,622.40, 728,433.60 and 317,660.80 is: 476,491.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,622.40 : 728,433.60 = 317,660.80 : x
  2. Step 2: Convert to fraction form
    485,622.40/728,433.60 = 317,660.80/x
  3. Step 3: Cross multiply
    485,622.40x = 728,433.60 × 317,660.80
  4. Step 4: Simplify right side
    485,622.40x = 231,394,800,122.88
  5. Step 5: Solve for x
    x = 231,394,800,122.88/485,622.40
  6. Step 6: Final answer
    x = 476,491.20

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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.