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Finding the Fourth Proportional to 71,640,398.56, 107,461,764.24 and 20,522,218.72

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Solution

The fourth proportional to 71,640,398.56, 107,461,764.24 and 20,522,218.72 is: 30,783,662.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,640,398.56 : 107,461,764.24 = 20,522,218.72 : x
  2. Step 2: Convert to fraction form
    71,640,398.56/107,461,764.24 = 20,522,218.72/x
  3. Step 3: Cross multiply
    71,640,398.56x = 107,461,764.24 × 20,522,218.72
  4. Step 4: Simplify right side
    71,640,398.56x = 2,205,353,829,770,354.25
  5. Step 5: Solve for x
    x = 2,205,353,829,770,354.25/71,640,398.56
  6. Step 6: Final answer
    x = 30,783,662.21

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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.