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Finding the Fourth Proportional to 661,592,004.80, 990,876,352.80 and 389,494,212.80

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Solution

The fourth proportional to 661,592,004.80, 990,876,352.80 and 389,494,212.80 is: 583,351,373.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,592,004.80 : 990,876,352.80 = 389,494,212.80 : x
  2. Step 2: Convert to fraction form
    661,592,004.80/990,876,352.80 = 389,494,212.80/x
  3. Step 3: Cross multiply
    661,592,004.80x = 990,876,352.80 × 389,494,212.80
  4. Step 4: Simplify right side
    661,592,004.80x = 385,940,605,015,971,072
  5. Step 5: Solve for x
    x = 385,940,605,015,971,072/661,592,004.80
  6. Step 6: Final answer
    x = 583,351,373.98

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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.