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Finding the Fourth Proportional to 61,187,809.60, 91,785,861.60 and 20,801,339.20

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Solution

The fourth proportional to 61,187,809.60, 91,785,861.60 and 20,801,339.20 is: 31,203,418.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,187,809.60 : 91,785,861.60 = 20,801,339.20 : x
  2. Step 2: Convert to fraction form
    61,187,809.60/91,785,861.60 = 20,801,339.20/x
  3. Step 3: Cross multiply
    61,187,809.60x = 91,785,861.60 × 20,801,339.20
  4. Step 4: Simplify right side
    61,187,809.60x = 1,909,268,840,905,854.50
  5. Step 5: Solve for x
    x = 1,909,268,840,905,854.50/61,187,809.60
  6. Step 6: Final answer
    x = 31,203,418.68

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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.