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Finding the Fourth Proportional to 81,462,661.60, 122,191,227.60 and 20,878,981.60

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Solution

The fourth proportional to 81,462,661.60, 122,191,227.60 and 20,878,981.60 is: 31,317,763.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,462,661.60 : 122,191,227.60 = 20,878,981.60 : x
  2. Step 2: Convert to fraction form
    81,462,661.60/122,191,227.60 = 20,878,981.60/x
  3. Step 3: Cross multiply
    81,462,661.60x = 122,191,227.60 × 20,878,981.60
  4. Step 4: Simplify right side
    81,462,661.60x = 2,551,228,392,741,812
  5. Step 5: Solve for x
    x = 2,551,228,392,741,812/81,462,661.60
  6. Step 6: Final answer
    x = 31,317,763.78

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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.