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Finding the Fourth Proportional to 665,855,997.60, 998,783,996.40 and 613,302,679.20

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Solution

The fourth proportional to 665,855,997.60, 998,783,996.40 and 613,302,679.20 is: 919,954,018.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,855,997.60 : 998,783,996.40 = 613,302,679.20 : x
  2. Step 2: Convert to fraction form
    665,855,997.60/998,783,996.40 = 613,302,679.20/x
  3. Step 3: Cross multiply
    665,855,997.60x = 998,783,996.40 × 613,302,679.20
  4. Step 4: Simplify right side
    665,855,997.60x = 612,556,900,934,203,136
  5. Step 5: Solve for x
    x = 612,556,900,934,203,136/665,855,997.60
  6. Step 6: Final answer
    x = 919,954,018.80

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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.