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Finding the Fourth Proportional to 81,991,900.80, 123,035,090.40 and 30,910,579.20

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Solution

The fourth proportional to 81,991,900.80, 123,035,090.40 and 30,910,579.20 is: 46,383,677.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,991,900.80 : 123,035,090.40 = 30,910,579.20 : x
  2. Step 2: Convert to fraction form
    81,991,900.80/123,035,090.40 = 30,910,579.20/x
  3. Step 3: Cross multiply
    81,991,900.80x = 123,035,090.40 × 30,910,579.20
  4. Step 4: Simplify right side
    81,991,900.80x = 3,803,085,906,188,360
  5. Step 5: Solve for x
    x = 3,803,085,906,188,360/81,991,900.80
  6. Step 6: Final answer
    x = 46,383,677.77

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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.