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Finding the Fourth Proportional to 639,738,010.30, 959,607,015.45 and 536,425,879.90

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Solution

The fourth proportional to 639,738,010.30, 959,607,015.45 and 536,425,879.90 is: 804,638,819.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,738,010.30 : 959,607,015.45 = 536,425,879.90 : x
  2. Step 2: Convert to fraction form
    639,738,010.30/959,607,015.45 = 536,425,879.90/x
  3. Step 3: Cross multiply
    639,738,010.30x = 959,607,015.45 × 536,425,879.90
  4. Step 4: Simplify right side
    639,738,010.30x = 514,758,037,620,979,136
  5. Step 5: Solve for x
    x = 514,758,037,620,979,136/639,738,010.30
  6. Step 6: Final answer
    x = 804,638,819.85

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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.