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Finding the Fourth Proportional to 621,113,911.20, 930,879,610.20 and 330,120,439.20

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Solution

The fourth proportional to 621,113,911.20, 930,879,610.20 and 330,120,439.20 is: 494,760,107.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,113,911.20 : 930,879,610.20 = 330,120,439.20 : x
  2. Step 2: Convert to fraction form
    621,113,911.20/930,879,610.20 = 330,120,439.20/x
  3. Step 3: Cross multiply
    621,113,911.20x = 930,879,610.20 × 330,120,439.20
  4. Step 4: Simplify right side
    621,113,911.20x = 307,302,385,761,548,800
  5. Step 5: Solve for x
    x = 307,302,385,761,548,800/621,113,911.20
  6. Step 6: Final answer
    x = 494,760,107.96

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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.