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Finding the Fourth Proportional to 645,763.78, 967,311.60 and 378,720.15

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Solution

The fourth proportional to 645,763.78, 967,311.60 and 378,720.15 is: 567,297.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,763.78 : 967,311.60 = 378,720.15 : x
  2. Step 2: Convert to fraction form
    645,763.78/967,311.60 = 378,720.15/x
  3. Step 3: Cross multiply
    645,763.78x = 967,311.60 × 378,720.15
  4. Step 4: Simplify right side
    645,763.78x = 366,340,394,248.74
  5. Step 5: Solve for x
    x = 366,340,394,248.74/645,763.78
  6. Step 6: Final answer
    x = 567,297.83

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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.