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Finding the Fourth Proportional to 279,775,011.60, 419,694,010.20 and 85,684,885.20

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Solution

The fourth proportional to 279,775,011.60, 419,694,010.20 and 85,684,885.20 is: 128,536,972.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,775,011.60 : 419,694,010.20 = 85,684,885.20 : x
  2. Step 2: Convert to fraction form
    279,775,011.60/419,694,010.20 = 85,684,885.20/x
  3. Step 3: Cross multiply
    279,775,011.60x = 419,694,010.20 × 85,684,885.20
  4. Step 4: Simplify right side
    279,775,011.60x = 35,961,433,083,114,628
  5. Step 5: Solve for x
    x = 35,961,433,083,114,628/279,775,011.60
  6. Step 6: Final answer
    x = 128,536,972.90

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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.