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Finding the Fourth Proportional to 81,964,840.40, 123,088,978.20 and 43,701,088.40

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Solution

The fourth proportional to 81,964,840.40, 123,088,978.20 and 43,701,088.40 is: 65,627,191.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,964,840.40 : 123,088,978.20 = 43,701,088.40 : x
  2. Step 2: Convert to fraction form
    81,964,840.40/123,088,978.20 = 43,701,088.40/x
  3. Step 3: Cross multiply
    81,964,840.40x = 123,088,978.20 × 43,701,088.40
  4. Step 4: Simplify right side
    81,964,840.40x = 5,379,122,317,383,873
  5. Step 5: Solve for x
    x = 5,379,122,317,383,873/81,964,840.40
  6. Step 6: Final answer
    x = 65,627,191.99

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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.