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Finding the Fourth Proportional to 621,206.80, 931,810.20 and 221,860.60

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Solution

The fourth proportional to 621,206.80, 931,810.20 and 221,860.60 is: 332,790.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,206.80 : 931,810.20 = 221,860.60 : x
  2. Step 2: Convert to fraction form
    621,206.80/931,810.20 = 221,860.60/x
  3. Step 3: Cross multiply
    621,206.80x = 931,810.20 × 221,860.60
  4. Step 4: Simplify right side
    621,206.80x = 206,731,970,058.12
  5. Step 5: Solve for x
    x = 206,731,970,058.12/621,206.80
  6. Step 6: Final answer
    x = 332,790.90

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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.