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Finding the Fourth Proportional to 664,871,999.80, 997,307,999.70 and 551,625,791.80

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Solution

The fourth proportional to 664,871,999.80, 997,307,999.70 and 551,625,791.80 is: 827,438,687.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,871,999.80 : 997,307,999.70 = 551,625,791.80 : x
  2. Step 2: Convert to fraction form
    664,871,999.80/997,307,999.70 = 551,625,791.80/x
  3. Step 3: Cross multiply
    664,871,999.80x = 997,307,999.70 × 551,625,791.80
  4. Step 4: Simplify right side
    664,871,999.80x = 550,140,815,002,986,624
  5. Step 5: Solve for x
    x = 550,140,815,002,986,624/664,871,999.80
  6. Step 6: Final answer
    x = 827,438,687.70

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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.