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Finding the Fourth Proportional to 818,642,504.50, 1,129,841,872.60 and 521,189,728

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Solution

The fourth proportional to 818,642,504.50, 1,129,841,872.60 and 521,189,728 is: 719,315,177.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    818,642,504.50 : 1,129,841,872.60 = 521,189,728 : x
  2. Step 2: Convert to fraction form
    818,642,504.50/1,129,841,872.60 = 521,189,728/x
  3. Step 3: Cross multiply
    818,642,504.50x = 1,129,841,872.60 × 521,189,728
  4. Step 4: Simplify right side
    818,642,504.50x = 588,861,978,263,404,544
  5. Step 5: Solve for x
    x = 588,861,978,263,404,544/818,642,504.50
  6. Step 6: Final answer
    x = 719,315,177.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.