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Finding the Fourth Proportional to 82,978,603.60, 124,467,905.40 and 54,313,157.20

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Solution

The fourth proportional to 82,978,603.60, 124,467,905.40 and 54,313,157.20 is: 81,469,735.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,978,603.60 : 124,467,905.40 = 54,313,157.20 : x
  2. Step 2: Convert to fraction form
    82,978,603.60/124,467,905.40 = 54,313,157.20/x
  3. Step 3: Cross multiply
    82,978,603.60x = 124,467,905.40 × 54,313,157.20
  4. Step 4: Simplify right side
    82,978,603.60x = 6,760,244,912,344,930
  5. Step 5: Solve for x
    x = 6,760,244,912,344,930/82,978,603.60
  6. Step 6: Final answer
    x = 81,469,735.80

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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.